Arms

Question 1

Muscles of the arms

Answer 1

Coracobrachialis - flexes and adducts (brings in)

Biceps - primarily a flexor and supinator of the forearm but also involved in abduction and adduction to Radius bone

Triceps - 3 origins with the long head assisting in adduction but primarily a forearm extensor

Pectoralis major - many functions including flexion, extension, and adduction with medial rotation

Latissimus dorsi (lats) performs extension, adduction, and medial (internal) rotation of the arm

Teres major - also performs extension, adduction, and medial (internal) rotation of the arm

Deltoid - bulky muscle and acts as a shock absorber- main action is to abduct arm

SITS muscles

Question 2

Bones of forearm and hand

Answer 2

Radius - superficial and has a palpable edge that extends from the elbow to the wrist

Ulna - on thumb side is lateral to the ulna and is partially buried in muscle

Carpals - eight peddle-sized bones that form two rows

Metacarpals - five long bones spanning the palm of the hand

Phalanges - bones of the fingers

Question 3

Arm movements

Answer 3

Affect the thoracic spine and ribcage

Flexion of the arms creates extension of the spine and opens the anterior ribcage

Extension of the arms causes flexion of the spine and closes the ribcage ie roll up