M. Upper Limb Flashcards
(24 cards)
What is the upper limb?
Located between the shoulder joint and elbow joint
How many muscles does the upper arm contain?
4
What are the 4 different upper limb muscles?
Biceps brachii, brachialis, coracobrachialis, triceps brachii
Where are the 4 muscles located, anterior or posterior
compartment?
Biceps brachii, brachialis, and coracobrachialis (BBC) ANTERIOR
Triceps brachii POSTERIOR
How are all of the 3 anterior muscle compartments innervated by?
Musculocutaneous nerve
Which artery supplies the upper arm?
Brachial artery
Is biceps brachii a two head muscle ?
Yes
Where is the bicep brachii located anterior to?
Humerus (and no attachment to bone itself)
What is the bicipital aponeurosis ?
A connective tissues sheet that the tendon of biceps brachii enters through the forearm
What does the bicipital aponeurosis form?
Forms the roof of cubital fossa and blends w deep fascia of the anterior forearm
What is the origin of biceps brachii ?
Long head originates from the supraglenoid tubercle of the scapula. Both heads insert distally into the radial tuberosity and the fascia of the forearm via bicipital aponeurosis
What is the function of the biceps brachii ?
Supination of the forearm, flexes arm at elbow and shoulder
What is the biceps brachii innervation?
Musculocutaneous nerve. The bicep tendon reflex test the spinal cord C6
Where does the coracobrachilis lie in?
Deep and superior to biceps brachii
Where does the coracobrachialis originate from?
Originated from the coracoid process of scapula. The muscle passes through the axilla and attaches to the medial side of the humeral shaft at the level of the deltoid tubercle
What is the function of coracobrachialis?
Flexion of the arm at the shoulder and weak adduction
What is the innervation of the coracobrachialis?
Musculocutaneous nerve
Where does the brachialis lie in?
Lies deep and distally from the biceps brachii. It forms the floor of the cubital fossa
Where does the brachialis originate from?
From the medial and lateral surface of the humeral shaft and inserts into the ulnar tuberosity , distal from the elbow joint.
Where does the arterial supply to the triceps brachii?
Via profunda brachii artery
How many heads does the triceps brachii have and what are they called?
3
Long head
Lateral head
Medial head
Where does the triceps brachii originate from?
(3 heads)
Long head - originates from infraglenoid tubercle
Lateral head- originates from the humerus ,superior to radial groove
Medial head- originates from the humerus, inferior to radial groove
Distally, the heads are at a tendon and insert in the olecranon of the ulna
What is the function of triceps brachii?
Extension of the arm at the elbow
What is the innervation of the triceps brachii?
Radial nerve
Triceps tendon test C7
(In some people it innervates in the axillary nerve)
