Human Anatomy Exam I 2
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- what general parts make up the brachial plexus?
- roots, trunks, divisions, cords and nerves (most of which arise from the cords)
- what spinal nerves form the roots of the brachial plexus?
- c5, c6, c7, c8 and t1
- what spinal nerves make up the upper trunk?
- c5 and c6
- what spinal nerve(s) make up the middle trunk of the brachial plexus?
- c7
- whawt spinal nerves unite to form the lower trunk of the brachial plexus?
- c8 and t1
- Each of the trunks dvide into what?
- into an anterior division and a posterior division
- how is the lateral cord formed?
- by the anterior divisions of the upper and middle trunk
- how is the medial cord formed?
- by the anterior division of the lower trunk
- how is the posterior cord formed?
- by the three posterior divisions of the upper, middle and lower turnks.
- what nerve arises from the upper trunk?
- the suprascapular nerve
- what nerve arises soley from the lateral cord?
- the musculocutaneous nerve
- which nerve arises from the medial cord?
- the ulnar nerve
- which nerve arises from part of the lateral cord and the medial cord?
- the median nerve
- the posterior cord divides into what two nerves?
- the axillary and the radial nerves.
- name the nerve fibers of the ulnar nerve.
- c8 and t1
- name the nerve fibers of the axillary and suprascapular nerves.
- c5 and c6
- name the nerve fibers of the musculocutaneous nerve.
- c5 and c6
- name the major parts at the lower end of the humerus.
- the lateral epicondyle, capitulum, trochlea, and medial epicondyle.
- name the major parts at the upper end of the radius.
- the head and neck of the radius.
- name the major parts at the upper end of the ulna.
- olecranon process and trochlear notch.
- the capitulum of the humerus articuloates with the head of the radius and the trochlea of the humerus artiulates with the trochlear notch of the ulna, in what joint?
- the elbow joint.
- what does the elbow joint provide?
- for the flexion and extension of the forearm.
- describe biceps brachii.
- flexes and supinates the forearm; innervated by the musculocutaneous nerve
- describe brachialis.
- flexes the forearm; innervated by the musculocutaneous nerve
- describe triceps brachii.
- extends the forearm; innervated by the radial nerve.
- the biceps tendon reflex test assesses spinal cord reflex activity where?
- c5 and c6 levels of the spinal cord.
- the triceps tendon reflex test assesses spinal cor reflex activity where?
- c7 and c8 levels of the spinal cord
- the proximal and distal radioulnar joints are formed by what?
- the radius and ulna articulate with each other at their upper and lower ends
- what do the proximal and distal radioulnar joints provide for?
- the pronation and supination of the forearm.
- what does an upper brachial plexus injury involve?
- the c5 and c6 roots and/or the upper trunk.
- what is erb's palsy?
- loss of the muscles deltoid and biceps brachii maybe by an upper brachial plexus injury.