The coronoid process is a structure on the proximal ulna, not to be confused with the coracoid on the scapula or the conoid on the clavicle. The coronoid process forms part of the trochlear notch on the ulna.

When the ulna is extended, the olecranon, which is an extension of the ulna, fits into the olecranon fossa of the humerus. 

The supraspinatus is responsible for initiating abduction of the arm for the first 15 degrees, while the deltoid continues the abduction. 

There are only four muscles that comprise the rotator cuff. All of the answer choices except the teres major are rotator cuff muscles.

The wrist contains 8 carpal bones. The scaphoid, lunate, triquetrum, and pisiform make up the proximal row, while the trapezium, trapezoid, capitate, and hamate make up the distal row. A mnemonic to help you remember these eight bones is: Some Lovers Try Positions That They Can't Handle. In the anatomical position, from lateroproximal to mediodistal: Scaphoid, Lunate, Triquetrum, Pisiform, Trapezium, Trapezoid, Capitate, Hamate.

The olecranon is a feature of the ulna. It is commonly known as the elbow. The coracoid process can be found on the scapula and both the deltoid tuberosity and trochlea can be found on the humerus.

The coracoid process is a projection on the scapula that serves as an attachment site for ligaments which help to stabilize the shoulder. It is located proximally to the articulation of the humerus and scapula. The head of the humerus is smooth and round to fit into the glenoid cavity of the scapula. It has no sites for attachment. The humerus is the long bone of the upper arm. It is the head of the humerus that interacts with the ligaments attaching to the coracoid process. The clavicle, also known as the collar bone, articulates with another projection from the scapula called the acromion. It is posterior to the coracoid process.

A sesamoid bone is one that lies within a tendon. The tendon slides across the bone to reduce friction, increase the force the tendon can pull with, and/or prevent the tendon from flattening when it is taut. There are several sesamoid bones in the body, but only one in the wrist. It is called the pisiform and it lies within the tendon of the flexor carpi ulnaris muscle.

The ulna is the longer and thinner bone in the forearm. The radius is the shorter, thicker bone of the forearm. The fibula is the long thin bone of the leg. The olecranon is a bony eminence of the ulna, that is palpable as the elbow.

The wrist is composed of eight bones. The scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, and hamate. The talus is a bone in the ankle.