Questions tagged [anatomy]

The study of the structure of organisms and their parts.

58 questions with no upvoted or accepted answers
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Anatomical Angle Made by the Fingers of an Extended Palm

Does the angle made by the fingers (excluding the thumb) of an extended palm (as shown in the figure below) have a name (such as the Lovibond or Cobb angle, for instance) ? I have already checked ...
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57 views

What does “molecular” mean in the context of anatomy, for example the molecular layer of cerebral cortex

The first apical layer of the cerebral cortex is also called as the molecular layer, I could not find the exact reason of the naming. What I found: Molecular alongside its primary meaning in ...
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236 views

Are there predefined implantation sites in mammalian uterus?

I do surgical embryo transfer of genetically modified (microinjected) mouse embryos (at 1 or 2 cell stage). As most of the constructs are new, we expect that it may affect birth rate. In case there ...
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52 views

Medical terminology for asymmetrically-shaped paired body parts?

Some people have different sized feet [source], a limb that is slightly longer than the contralateral (on other side of the body) limb [source], or other instances of paired body parts being different ...
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1k views

Kidney transplant and adrenal glands

When a kidney is transplanted from a donor to a recepient does the surgery occur keeping the donor's adrenal gland intact over the kidney or is the kidney minus the adrenal gland over it transplanted ...
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63 views

What structures (i.e. organs) are suspended by tensile forces?

In several areas of biomechanical literature I have read, the concept of "tensegrity" has arisen. Definitions are as follows: “The integrity of a stable structure balanced by continuous structural ...
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2k views

Do any non-human species have packed abs?

The classic "six-pack abs" in humans is due to tendons stretched across the abdominal muscles and low body fat. Do any other animals have a similar arrangement of tendons that could result in visible "...
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312 views

How does glucose delivered intraperitoneal (i.p.) get into the peripheral circulation?

Intraperitoneal delivery of drugs or fluids is something that occurs much more frequently in veterinary medicine than clinical medicine. In veterinary medicine or scientific studies using animals, ...
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627 views

Total number of pleura in the exoskeleton of cockroach

Basically as far as i know cockroach consists of 10 terga and 9 sterna but what are the total number of pleura present in the cockroach. Pleura are situated between tergum and sternum of a body ...
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72 views

What causes the shape of the dense structure in this “giant squid egg” sac?

The YouTube video Swimming Next To Giant Squid Egg shows a giant egg of a squid and/or an egg of a giant squid. Text in the video's description includes the text quoted below, which indicates that the ...
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50 views

What is the biggest structure in nature for structural coloration?

I'm interested in the actual sizes behind structural coloration: I find it fascinating and I think it may have a couple very nice applications. The problem is I couldn't find anything but vague ...
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39 views

Does human skeletal muscle fascia grow new additional collagen in response to increases in skeletal muscle size?

For example, if a human skeletal muscle is growing repeatedly due to periodic weightlifting, does the fascia eventually respond to the increasing volume by growing more quantities of collagen or other ...
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938 views

Does the humeroradial joint move medially/laterally?

The humeroradial joint is a ball-and-socket joint that, if unrestricted, would allow for movement around all possible axes. However (as succinctly stated from Wikipedia): the annular ligament, by ...
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146 views

Has any animal ever had a rotating part?

Outside of microscopic structures (I'm thinking of a flagellum, which I think is a true motor) has any animal evolved a part that continually rotates compared to the rest of its body?
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73 views

Why the name hypopharynx?

Why the tongue (like structure) in cockroach (or other insects) is called hypopharynx? In humans I know it's the lower part of pharynx, not a structure. Isn't this anatomical name misleading? Are ...
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78 views

Is lung size/shape a factor in long-continuous running of animals?

Apart from other factors, does lung shape/structure/size play any role in long-continuous running animals. Is there any similarity in lung structure between different long-continuous running species?
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Terrestrial Vertebrate Limbs

This question is regarding the conversation that took place here: Why don't mammals have more than 4 limbs?. I'm not sure if someone mentioned this and I just missed it, but everyone is talking ...
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177 views

Where are the gastralia (stomach ribs) attached?

Crocodiles and some dinosaurs have a second set of ribs between the sternum and pelvis called gastralia. Where are the gastralia attached to the rest of the skeleton?
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50 views

Why do vertebrates have an oesophagus?

As far as I know, the oesophagus in vertebrates has no digestive or absorptive function. It is simply a conduit from the mouth to more distal parts of the gastrointestinal tract. Why have it at all, ...
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13 views

Do endocrine cells always lie adjacent to capillaries?

The circulatory system transports plasma contents to the body via the interstitial circulatory system, reabsorbed with the lymphatic system. Cell metabolism "waste products" are transported into the ...
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31 views

Origins of the body mechanics theory

In physical therapy and occasionally in sports coaching, there's often a precise description of the mechanics of what happens during the movement (which muscles are engaged, which joint moves where ...
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39 views

Can a Chihuahua and a Great Dane breed the “old fashioned way?”

I saw this vid: https://youtu.be/eu2qe-FNtjg And this question crossed my mind. The dog in the video seems to be boxer sized... And I wonder if that strategy would work with something a little ...
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38 views

Is there a conformal transformation that maps the skull of Panthera tigris to the one of Panthera leo?

While visiting the Museum of Natural History in Rouen a few months ago, I was stunned by the similarity between the skulls of Panthera tigris and Panthera Leo: the overall shapes were very similar and ...
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11 views

Why do neutrophils have segmented nuclei?

To clarify, I'm not asking what causes high segmentation in neutrophils. I'm asking how segmented nuclei function in a regular neutrophil cell.
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152 views

Movement of the Thoracic Cage During Movements of the Thoracic Spine

Just for a bit of context: I am trying to create a 3D digital model of the human skeleton as the first step towards computer generated muscle simulation, and as such I want the skeleton to be as ...
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29 views

For each movement performed by both the gluteus minimus and medius, what percentage of the movement do the gluteus minimus and medius account for?

From what I read on Wikipedia, all functions of the gluteus minimus are mirrored by the gluteus medius. Additionally, the gluteus medius is larger than the gluteus minimus (see comparative images here)...
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968 views

Average width of the male body

I've been looking for the average width (at widest point) of the average American male body but couldn't find it anywhere so far. When I say "widest point", I mean that if you draw a rectangle (that ...
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99 views

How “unique” human vagina is?

Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry. But what about vaginal shape? I know ...
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332 views

Is this claim about equine anatomy true?

While bumping through obscure corners of the Internet, I encountered the following image posted somewhere. The horse anus is a marvel of evolutionary biology. Like most mammals, rhythmic ...
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87 views

What does it mean for sodium and water reabsorption to be “coupled” in the nephron?

If sodium is transported across the tubule membrane down the concentration gradient established via the $Na^+$/$K^+$ exchanger via symport with glucose and antiport with hydrogen, and water is ...
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57 views

How do emus/ostriches/rheas have their upper leg connected to the rest of their body?

I'm working on a model for educational graphics of an emu in conjunction with other information, but there aren't a lot of great reference images. The thing that's most unclear is how the upper leg ...
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929 views

Three foramen lying in one vertical plane

In the human skull we can see that 3 foramina named as supraorbital notch(foramen) , infraorbital foramen and mental foramen share a common vertical plane. Is there any surgical significance of for ...
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380 views

How is the Force of Contraction Applied to the Tendons by the Muscle's Individual Fibers?

Image and question have been updated for clarity! The image above is a side view of a semi-transparent skeletal muscle. The dark red lines represent individual fibers, the blue lines represent ...
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47 views

Correctly depicting spider anatomy

First off, my specific query: When depicting a spider - be it in a picture or in textual/verbal description - should the chelicerae be always be placed so that they project outwards from the ventral ...
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42 views

Is the enteric nervous system found only in vertebrates?

The enteric nervous system is distinguished by being autonomous from the central nervous system and capable of independent action, such as the peristaltic reflex. For this reason the the intestines ...
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821 views

What makes the hepatic portal vein unique?

What makes the hepatic portal vein unique?, is it because it begins and ends with capillaries or because it carries digested food.
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219 views

Can human eys/the brain be trained to see with bidirectional monocular vision?

Most people have a dominant eye, and while it uses its non-dominant eye in tandem with the dominant eye most of the time, the brain, being an expert in eliminating redunant information, ignores the ...
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113 views

The first species having circle of Willis (circulus arteriosus cerebri)?

I know mammals are not the only species that have this anatomical unit (i.e. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3982101/). But I was wondering what was the first species that had a similar ...
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68 views

Why are belly buttons on the stomach (why does the umbilical cord end up attached to the stomach)?

Belly buttons are at the site where the umbilical cord was attached to us as we developed inside our mothers. The same is true for all placental mammals. Why are belly buttons on the stomach? Why ...
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88 views

What is the radius of the Ora Serrata and lens in rabbits?

I'm interesting in estimating the surface area of the hyaloid membrane connecting the vitreous and aqueous chambers. This is a crude estimate however i'm struggling to find parameter values for ...
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7 views

Nerves that supply the hip joint

From this page https://www.instantanatomy.net/leg/joints/hipnervesupply.html I understood that the hip joint is innervated by the femoral nerve because of the rectus femoris muscle And the sciatic ...
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Why PCT stains darker than DCT?

Both PCT and DCT have Simple cuboidal epithelium in then, but PCT also has microvilli . But why do they stain differently. In histology slides PCT stains darker than DCT can anyone explain why ?
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Does any tendon in humans receive a high amount of blood supply? Or is the property of not receiving a large blood supply a constant across tendons?

I read on https://www.physiocomestoyou.co.uk/blog/all-you-need-to-know-about-tendons/ (mirror): [Tendons] do not have a large blood supply. Does any tendon in the human body receive a high amount ...
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24 views

is there any kind of paw/pads lines or paw muscle anatomy in animal hands?

just like in the title my question is, is there any kind of paw/pads lines or paw muscle anatomy in animal hands? or its pretty much random? example like mammary lines as bilateral structure that ...
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38 views

How much does Scolopendra gigantea weigh?

For somewhat understandable reasons, most references I've found related to "size" of Scolopendra gigantea, and centipedes in general, seem to focus on length. There are numerous sites, blogs, etc., ...
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25 views

Is medullary cavity totally absent in clavicle?

In one of my books it said that medullary cavity is totally absent in clavicle but is it completely true ? One of my teachers said only the medial 2/3 of clavicle has a medullary cavity.
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Ink blue molds/fungi/dermatophytes

Which of the above has naturally ink blue hyphae? Are there any that make both Ochratoxin A and fumononis toxin and have hyphae that color?
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What soft tissue separates bones of toes?

I need to know a little about the "knuckles" of toes; specifically the 4 areas that separate the 5 proximal/metatarsal joins. I'd like to know the terms for areas that might be damaged if the width ...
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62 views

Do birds have quadriceps and thighs fused into their hips?

I'm looking at 3D modeling a large bird like an emu or ostrich, but I don't know how the muscles surrounding the femur connect to the hips/back. It seems weird that the entire thigh and quadriceps ...
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123 views

Which word is used to indicate that a vessel is “blood-filled” during a necropsy?

I'm translating a necropsy report, and one sentence says: Синусоиды полнокровные. Портальные тракты сохранены, сосуды умеренно полнокровные. The sinusoids are plethoric. The portal tracts are ...