Label the bony structures of the shoulder and upper limb

Question 1

Question 2

Describe the name and feature of 4 bones of the upper limb or lower limb.

Question 3

List the bones of the pectoral girdle and the upper limb.

Answer to question 1

Answer to question 2

Four important upper limb bones include the scapula, humerus, radius, and ulna.

The scapula is also known as the shoulder blade and is one part of the shoulder joint. The bony landmark known as the glenoid fossa is the specific structure that makes up the “socket” portion of the ball and socket joint.

The humerus is the upper arm bone and is the second part to the shoulder joint. Specifically, the head of the humerus makes up the “ball” portion of the ball and socket joint.

The radius and ulna are both lower arm bones. The radius will sit on the thumb side and the ulna sits on the pinkie finger side. The radius specifically will twist over the ulna to allow for the actions of supination and pronation.

Answer to question 3

The pectoral girdle is the shoulder region of the appendicular skeleton and consists of the clavicle (collarbone) and the scapula (shoulder blade).

The upper limb makes up the arm, forearm, and hand. The long bone in the arm is called the humerus. The long bones in the forearm are the radius and the ulna. The hand has numerous short bones and contains three groups of bones. The wrist part is made up of bones, collectively called the carpals, which are scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, and hamate. The palm section is made up of five metacarpals, one for each digit (finger). Finally, the digits contain bones known as phalanges. Each digit except the thumb has three phalanges (distal, middle, proximal). Thumbs have no middle phalanges.

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