nerves Flashcards
(25 cards)
What is the brachial plexus?
A network of nerves that innervates the upper limb.
How many roots make up the brachial plexus?
Five roots.
Name the five roots of the brachial plexus.
C5, C6, C7, C8, T1.
True or False: The brachial plexus is formed from cervical and thoracic spinal nerves.
True.
What are the three trunks of the brachial plexus?
Upper, middle, and lower trunks.
Which trunk is formed from the C5 and C6 roots?
Upper trunk.
Fill in the blank: The lower trunk of the brachial plexus is formed from the _____ and _____ roots.
C8, T1.
What are the divisions of the brachial plexus?
Three anterior and three posterior divisions.
How many cords are formed from the divisions of the brachial plexus?
Three cords: lateral, medial, and posterior.
Which cord of the brachial plexus is formed from the anterior divisions of the upper and middle trunks?
Lateral cord.
True or False: The medial cord of the brachial plexus is formed from the anterior division of the lower trunk.
True.
What nerves arise from the lateral cord?
Musculocutaneous nerve and part of the median nerve.
From which cord does the ulnar nerve arise?
Medial cord.
What nerve is formed from the posterior cord of the brachial plexus?
Axillary nerve and radial nerve.
Multiple Choice: Which of the following nerves is NOT a terminal branch of the brachial plexus? A) Median B) Ulnar C) Femoral D) Radial
C) Femoral.
What is the primary function of the musculocutaneous nerve?
Innervates the anterior compartment of the arm.
Fill in the blank: The _____ nerve innervates the deltoid and teres minor muscles.
Axillary.
True or False: The radial nerve supplies the extensors of the forearm.
True.
What is the clinical significance of the brachial plexus?
Injuries can lead to loss of motor and sensory function in the upper limb.
What is Erb’s Palsy?
A condition resulting from injury to the upper trunk of the brachial plexus.
Which muscles are primarily affected in Erb’s Palsy?
Shoulder abductors and elbow flexors.
Fill in the blank: The brachial plexus can be assessed using _____ tests.
Neurodynamic.
What is the most common cause of brachial plexus injuries?
Trauma during childbirth or sports injuries.
True or False: The brachial plexus does not have any sensory functions.
False.
