1.3.1 Arm Flashcards
Muscles in the anterior compartment of the arm are innervated by?
Musculocutaneous nerve
Muscles in the posterior compartment of the arm are innervated by?
Radial Nerve
The two muscle compartments of the arm are separated by?
Dense connective Tissue: Lateral intermuscular septum and medial intermuscular septum
What is the origin of the short head of the bicep brachii?
Coracoid process
What is the origin of the long head of the bicep brachii?
Supraglenoid tubercle
The Long Head of the bicep brachii runs inside the ____ and is fixed into place by the ____?
Intertubercular groove
Transverse humeral ligament
Distal end of the bicep brachii forms a tendon that will attach?
Tuberosity of the radius
What other structure forms from the distal end of the bicep brachii? What does this merge with?
Bicipital aponeurosis merges with the antebrachial (deep) fascia
What is the function of the bicipital aponeurosis?
To protect the brachial artery and the median nerve. It also aids in lessening pressure on bicep tendon during pronation and supination
Bicipital Myotatic Reflex is testing?
Deep tendon reflex
Mainly testing C5-C6
Does the bicep attach to the humerus?
NO
What is the function of the bicep brachii?
Flexes the shoulder (arm) and elbow (forearm)
What are the characteristics of bicep tendonitis?
Tends to affect the long head of the bicep brachii that lies in the intertubercular groove
Caused by repetitive microtrauma - throwing or using a raquet
Symptoms are tenderness and crackling
What are characteristics of dislocation of the tendon of the long head of bicep brachii?
What are the characteristics of rupturing the tendon of the long head of bicep?
What are the characteristics of fracture- dislocation of the proximal humeral epiphysis?
What is the origin of the brachialis muscle?
Distal half of humerus
Where does the brachialis muscle insert?
It inserts onto the coronoid process and tuberosity of the ulna
What is the function of the coracobrachialis muscle?
It flexes and adducts the shoulder
What is the function of the brachialis muscle?
Flexes the elbow
What is the origin of the coracobrachialis?
The coracoid process
Where does the coracobrachialis insert?
Middle 1/3rd of the humerus
What nerve pierces through the coracobrachialis?
The musculocutaneous nerve passes through the coracobrachialis