MUSCULAR SYSTEM: UPPER LIMB EXAM WITH
COMPLETE SOLUTIONS
transitional area - answer region of upper limb and lower limb through which major
blood vessels and nerves pass from one area to the next
what are the rotator cuff muscles? - answer supraspinatus
infraspinatus
subscapularis
teres minor
function of rotator cuff tendons - answer reinforce shoulder joint capsule (except
inferior aspect) and stabilize joint
supraspinatus - answer origin: supraspinous fossa of scapula
insertion: greater tubercle of humerus
function: abduction of shoulder joint
innervation: suprascapular nerve
infraspinatus - answer origin: infaspinous fossa of scapula
insertion: greater tubercle of humerus
function: lateral rotation of shoulder joint
innervation: suprascapular nerve
subscapularis - answer origin: subscapular fossa
insertion: lesser tubercle of humerus
function: medial rotation of shoulder joint
innervation: brachial plexus (upper and lower subscapular nerves)
deltoid - answer origin: spine, acromion of scapula, lateral third of clavicle
insertion: deltoid tuberosity of humerus
function: abduction of shoulder joint (prime mover)
innervation: axillary nerve
, How are the muscles of the arm arranged? - answer anterior and posterior
compartments divided by the intermuscular septum
the anterior compartment of the arm is involved in: - answer flexion of shoulder and
elbow joint
the posterior compartment of the arm is involved in: - answer extension of shoulder and
elbow joint
what nerve innervates the anterior compartment of the arm? - answer
musculocutaneous
what nerve innervates the posterior compartment of the arm? - answer radial
what are the contents of the anterior compartment of the arm? - answer biceps brachii
brachialis
coracobrachialis
what are the contents of the posterior compartment of the arm? - answer triceps brachii
biceps brachii - answer origin: supraglenoid tubercle (long head); coracoid process
(short head)
insertion: radial tuberosity of radius
function: flexion of elbow joint, supination of forearm
innervation: musculocutaneous nerve
brachialis - answer origin: anterior surface of distal shaft of humerus
insertion: ulnar tuberosity
function: flexion of elbow joint
innervation: musculocutaneous
triceps brachii - answer origin: infraglenoid tubercle (long head); posterior shaft of
humerus (lateral and medial head)
insertion: olecranon process of ulna
function: extension of elbow joint
innervation: radial nerve
divisions of muscles in the forearm - answer anterior compartment (flexor-pronator)
COMPLETE SOLUTIONS
transitional area - answer region of upper limb and lower limb through which major
blood vessels and nerves pass from one area to the next
what are the rotator cuff muscles? - answer supraspinatus
infraspinatus
subscapularis
teres minor
function of rotator cuff tendons - answer reinforce shoulder joint capsule (except
inferior aspect) and stabilize joint
supraspinatus - answer origin: supraspinous fossa of scapula
insertion: greater tubercle of humerus
function: abduction of shoulder joint
innervation: suprascapular nerve
infraspinatus - answer origin: infaspinous fossa of scapula
insertion: greater tubercle of humerus
function: lateral rotation of shoulder joint
innervation: suprascapular nerve
subscapularis - answer origin: subscapular fossa
insertion: lesser tubercle of humerus
function: medial rotation of shoulder joint
innervation: brachial plexus (upper and lower subscapular nerves)
deltoid - answer origin: spine, acromion of scapula, lateral third of clavicle
insertion: deltoid tuberosity of humerus
function: abduction of shoulder joint (prime mover)
innervation: axillary nerve
, How are the muscles of the arm arranged? - answer anterior and posterior
compartments divided by the intermuscular septum
the anterior compartment of the arm is involved in: - answer flexion of shoulder and
elbow joint
the posterior compartment of the arm is involved in: - answer extension of shoulder and
elbow joint
what nerve innervates the anterior compartment of the arm? - answer
musculocutaneous
what nerve innervates the posterior compartment of the arm? - answer radial
what are the contents of the anterior compartment of the arm? - answer biceps brachii
brachialis
coracobrachialis
what are the contents of the posterior compartment of the arm? - answer triceps brachii
biceps brachii - answer origin: supraglenoid tubercle (long head); coracoid process
(short head)
insertion: radial tuberosity of radius
function: flexion of elbow joint, supination of forearm
innervation: musculocutaneous nerve
brachialis - answer origin: anterior surface of distal shaft of humerus
insertion: ulnar tuberosity
function: flexion of elbow joint
innervation: musculocutaneous
triceps brachii - answer origin: infraglenoid tubercle (long head); posterior shaft of
humerus (lateral and medial head)
insertion: olecranon process of ulna
function: extension of elbow joint
innervation: radial nerve
divisions of muscles in the forearm - answer anterior compartment (flexor-pronator)
