10 Questions
Which nerve innervates the serratus anterior muscle?
Long thoracic nerve
Which nerve innervates the rhomb minor, rhomboid major, and levator scapulae muscles?
Dorsal scapular nerve
Which nerve innervates the supraspinatus and infraspinatus muscles?
Upper trunk
Which cord consists of the anterior divisions of the upper and middle trunks?
Lateral cord
Which nerve gives rise to the upper subscapular nerve, lower subscapular nerve, and axillary nerve?
Posterior cord
Which nerve innervates the muscles of the arm and originates from the spinal cord in the neck?
Dorsal scapular nerve
Which trunk gives rise to the nerve to the subclavius and the suprascapular nerve?
Upper trunk
Which nerve does not give any branches?
Middle trunk
Which cord consists of the posterior division of all trunks and gives rise to the axillary nerve?
Posterior cord
Which cord consists of the anterior division of the lower trunk and gives rise to the ulnar nerve?
Medial cord
Study Notes
Nerve Innervation
- The long thoracic nerve innervates the serratus anterior muscle.
- The dorsal scapular nerve innervates the rhomb minor, rhomboid major, and levator scapulae muscles.
- The suprascapular nerve innervates the supraspinatus and infraspinatus muscles.
Brachial Plexus
- The lateral cord consists of the anterior divisions of the upper and middle trunks.
- The posterior cord gives rise to the axillary nerve.
- The upper trunk gives rise to the nerve to the subclavius and the suprascapular nerve.
- The medial cord consists of the anterior division of the lower trunk and gives rise to the ulnar nerve.
Nerve Characteristics
- The radial nerve does not give any branches.
- The brachial plexus is responsible for innervating the muscles of the arm and originates from the spinal cord in the neck.
Test your knowledge of the nerve network originating from the spinal cord in the neck and innervating the muscles of the arm. Identify the segments and their corresponding muscle innervations.
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