Comparative Anatomy of Humerus in Animals

Which species has a humerus that is relatively longer and slender compared to the others?

What is a distinctive feature of the horse's humerus?

In which animal is the deltoid tuberosity formed as a low ridge?

Which animal has a supracondylar foramen that gives passage to the median nerve and brachial artery?

What feature distinguishes the humerus of the pig when compared to others?

Which anatomical feature is unique to the rabbit's humerus?

What is an identifying characteristic of the lateral tuberosity in sheep and goats?

Which species has the musculospiral groove described as shallow?

What significant feature is associated with the rabbit's humerus?

What is the shape of the shaft of the humerus in most ruminants compared to that of the ox?

Sheep and Goat Humerus

The humerus is longer and more slender than in the ox.
The deltoid tuberosity is closer to the proximal end and less prominent.
The lateral tuberosity is smaller and doesn't overhang the bicipital groove.
The olecranon and coronoid fossa are shallower.
The shaft is round or oval, different from the triangular shape in the ox.

Horse Humerus

The deltoid tuberosity is more prominent.
The intertuberal groove is subdivided by an intermediate ridge or tubercle.
The cranial part of the greater tuberosity does not arch inwards.

Dog Humerus

The deltoid tuberosity is a low ridge.
The musculospiral groove is shallow.
The greater tuberosity is undivided.
The radial and olecranon fossae are deeper and may communicate through a supratrochlear foramen, which does not contain soft tissue.

Cat Humerus

The mediodistal part of the humerus above the medial epicondyle has a supracondylar foramen for the median nerve and brachial artery.

Pig Humerus

The humerus resembles an "italic f" due to proximal and distal end inclinations.
The teres tubercle is absent.
The deltoid tuberosity is small.
The olecranon fossa is deep and may be perforated (supratrochlear foramen).
The condyles are of equal size.

Rabbit Humerus

The head is more extensive and globular.

Fowl Humerus

The humerus is parallel to the thoracic vertebrae when the wing is at rest.
The proximal extremity has a pneumatic foramen on the medial aspect.
The head is elongated or oval.
The proximal extremity craniolaterally presents the deltoid ridge.
The distal extremity has two condyles, the larger one articulating with the radius.
The ulna is smaller than the radius.

Explore the distinctive features of the humerus in various animals such as sheep, goats, horses, dogs, and cats. This quiz covers specific anatomical traits that differentiate the humerus across these species, highlighting both structural and functional aspects. Test your knowledge on how the humerus varies and what these differences signify for each animal’s anatomy.