MSA Quiz #5 Biceps Brachii, Triceps Brachii, Coracobrachialis, Axillary endangerment sites, and bony landmarks and movement

What is the name of the thin sheet of fascia extending from the distal biceps brachii tendon?

Bicipital aponeurosis

As you follow the biceps brachii belly proximal, it becomes deep to which muscle?

Deltoids anterior fibers

Which head of the biceps brachii passes thru the intertubercular groove?

Long head

triceps brachii

Only muscle located on the posterior arm. Creates extension at elbow and shoulder, is antagonist at both joints to the biceps brachii. 3 heads- Long-extends off infraglenoid tubercle of scapula Lateral-lies superficial beside the deltoid medial-lies most underneath long head Aside from proximal portion, which is deep to deltoid, the rest is superficial and easily accessible ACTION- All heads- extend the elbow/humeroulnar joint Long head- extend the shoulder (G/H joint) Adduct the G/H joint ORIGIN- Long head-infraglenoid tubercle of the scapula Lateral head-posterior surface proximal half of the humerus Medial head-posterior surfaced c distal half of the humerus INSERTION-olecranon process G the ulna NERVES-Radial C6,7,8,T1 3heads 3bellies 3origins 3actions 3bones

The eight carpals

SLTPHCTT So long to pinky here comes the thumb SCAPHOID LUNATE TRIQUETRUM PISIFORM HAMATE CAPITATE TRAPEZOID TRAPEZIUM

Biceps Brachii AOIN

Superficial Anterior surface Type of muscle-Parallel muscle/fusiform 2heads 2joints 2origins 2bellies 2flexion 2 insertions ACTION- Flex the humeroulnar joint (elbow) Supinate the forearm Flex the glenohumeral joint (shoulder) ORIGIN- Short head-coraciod process of scapula Long head--supraglenoid tubercle of scapula INSERTION- Tuberosity gf the radius and aponeurosis of the biceps brachii NERVES- Musculocutaneous C5, 6 *Tendon of long head passes thru intertubercular groove of the humerus. *Primary muscle of forearm supination *Biceps under anterior fibers of deltoidb

The long head of the triceps brachii weaves between which two muscles before attaching to the infraglenoid tubercle?

teres major and teres minor

Coracoacromial ligament

Unlike most ligaments which holds two bones together, this one attaches the scapulas coracoid process to its acromion. Along with acromion, this ligament forms the corachromial arch across the top of the shoulder. Arch helps protect rotator cuff tendons and subcromial bursa from direct trauma by the acromion. Deep to deltoid but still accessible.

in anatomical position, the coracobrachialis is deep to which two muscles?

anterior deltoid and pectoralis major

how can you position the shoulder to bring the belly of the coracobrachialis to a superficial head?

laterally rotate and abduct the shoulder. Read more about medial rotation and abducting pg99

to outline the distal tendon of the triceps brachii, which bony Landmark do you want to locate?

olecranon process

to locate the belly of the coracobrachialis, from which muscle would you slide off and into the axilla?

pectoralis major