Humerus and Clavicle (Left side)

Question 1

Upper and Lower Extremities

Answer 1

Consist of sixty bones

Question 2

Upper Extremity

Answer 2

Begins with the humerus and its attachment to the scapula at the shoulder joint, with the top of this joint formed in part by the union of the scapula to the clavicle

Question 3

Head of the Humerus

Answer 3

Location: Proximal end of the humerus, lies in the glenoid fossa of the scapula
Function: Forming a loose and freely movable joint
At least 3X the size of the glenoid fossa of the scapula, making dislocation of the shoulder a common injury

Question 4

Shoulder Joint

Answer 4

The advantage of the large head and small fossa in the shoulder joint is that this permits a tremendous range of motion not possible at other ball and socket joint locations

Question 5

Anatomical Neck

Answer 5

Slightly narrowed part of the humerus

Question 6

Greater Tubercle

Answer 6

Widens below the anatomical neck laterally

Question 7

Lesser TUbercle

Answer 7

Location: Widens below the anatomical neck anteriorly
Function: the attachment of powerful shoulder muscles

Question 8

Intertubercular (Bicipital) Groove

Answer 8

Location: Anterior surface of the humerus, situated btwn the greater and lesser tubercules is a long, narrow sulcus
Function: Houses the tendon of the long head of the biceps brachii muscle

Question 9

Surgical Neck

Answer 9

Location: Below the tubercles, the humerus narrows
Function: Frequent site of fractures

Question 10

Deltoid Tuberosity

Answer 10

Location: Above the midpoint of the humerus
Function: The insertion of the deltoid muscle

Question 11

The distal end of the humerus

Answer 11

Expanded to form the atriculations for the elbow joint

Question 12

Medial Epicondyle

Answer 12

Location: Medial Distal Surface
Function: Origin of several muscles, that act to flex the wrist and fingers

Question 13

Lateral Epicondyle

Answer 13

Location: Lateral surface
Function:The origin of several muscles that act to extend the wrist and fingers

Question 14

Trochlea (Pulley) `

Answer 14

Location: Medial end of the humerus
Function: The actual elbow joint, formed by joining the trochlea with the ulna

Question 15

Capitulum (Little head)

Answer 15

Location: More lateral end of the humerus
Function: Joins the head of radius with the enlarged upper end of the ulna (Olecranon process) extending into the olecranon fossa of the humerus

Question 16

Union of the head of the radius with the capitulum of the humerus

Answer 16

Function: Allows rotation of the radius and hence the hand in pronation and supination

Question 17

Pronation

Answer 17

Palm move posteriorly out of the anatomical position

Question 18

Supination

Answer 18

Palm moved anterioly, back to the anatomical position

Question 19

Lateral Supracondylar Ridge

Answer 19

Location: Extends above the lateral epicondyle
Function: Serves as the bony origin for the powerful brachioradialis muscle.