Ch 41 Brachial Plexus Flashcards
Network of intermingling and intertwining nerves that supplies the structures of the upper limb
brachial plexus
The brachial plexus is a spinal nerve plexus derived from _____ and never from ___
ventral rami; dorsal rami
The brachial plexus is formed directly from the ventral rami of spinal nerves: ___
c5, c6, c7, c8, and t1
The ventral rami of the brachial plexus combine to from __
trunks of the brachial plexus
The ventral rami of c5 and c6 join to form the
upper trunk
the ventral famous of c7 continues as the
middle trunk
the ventral rami on c8 and t1 join to form the
lower trunk
trunks are found in the
neck
Each trunk of the brachial plexus divides into an ___ and a ___
anterior division; posterior division
the anterior divisions of the upper and middle trunks join to form the
lateral cord
the anterior divisions of the __ and __ trunks join to form the lateral cord
upper and middle
the anterior division of the lower trunk all join to form the
medial cord
the posterior divisions of of the ____ trunk all join to form the posterior cord
upper, middle and lower
the three posterior divisions of the upper, middle, and lower trunks all join to for the ___
posterior cord
the three posterior divisions of the ____, ____, and ____ trunks all join to form the posterior cord
upper, middle and lower
Cords are all found in the
axilla
The names, lateral, posterior, and medial indicate their location in relation to the ___
axillary artery
The cords give off a total of __ nerves and then continue ___ as the four major nerves of the upper limbs
8, distally
Branches of Ventral Rami
Dorsal Scapular Nerve
Long thoracic
Branches of the Trunks
Nerve to the subclavius
Suprascapular Nerve
Branches of the Cords
Lateral Pectoral Nerve Medial Pectoral Nerve Medial brachial cutaneous nerve Medial antebrachial cutaneous nerve Upper subscapular nerve Thoracodorsal nerve Lower sub scapular nerve Axillary nerve
Nerves Derived from Cords (Primary Nerves)
Musculocutaneous Nerve
Ulnar Nerve
Radial Nerve
Median Nerve
The dorsal scapular nerve originates from the
ventral ramus of C5
The dorsal scapular nerve courses deep to ___ and enters the deep surface of the ____
levator scapula; rhomboids
What does the dorsal scapular nerve supply?
rhomboid major and rhomboid minor muscles
The long thoracic nerve originates from the
ventral rami of c5, c6, c7
The long thoracic nerve courses posterior to the _____ and courses on the ______
axillary artery
external surface of the serratus anterior
the long thoracic nerve supplies
serratus anterior
The nerve to the subclavius originates from
the upper trunk
The nerve tot he subclavius descends posterior to the ___
clavicle
the nerve to the subclavius supplies
subclavius muscle
the supra scapular nerve originates from
the upper trunk
The suprascapular nerve courses ____ and ____. This nerve passes through the _____ and enters the ____.
laterally, posteriorly; suprascpaular notch, supraspinous fossa
The suprascapular nerve supplies the
supraspinatus muscle , infraspinatus muscle
After supplying the supraspinatus muscle, the suprascapular nerve courses around the _____ and enters the ___ and supplies the
spine of the scapula; infraspinous fossa; infraspinatus muscle
The lateral pectoral nerve originates from the
lateral cord
the lateral pectoral nerve courses through the h_____ into the _______
fascia above the pectorals minor; deep surface of the pectorals major
what does the lateral pectoral nerve supply?
pectoralis major
the medial pectoral nerve originates from the
medial cord
The medial pectoral nerve pierces the ____ and passes through to the _____
pectoralis minor; pectoralis major
What does the medial pectoral nerve supply?
pec major and minor
The medial brachial cutaneous nerve originates from
the medial cord
The medial brachial cutaneous nerve pierces the ____
fascia of the proximal arm
What does the medial brachial cutaneous nerve supply?
skin on the lower medial arm
The medial antebrachial cutaneous nerve originates from the
medial cord
the medial antebrachial cutaneous nerve descends below the _____ where it pierces the ____
middle of the forearm; antebrachial fascia.
The middle antebrachial cutaneous nerve supplies the
skin on the medial forearm
The upper subscapular nerve originates from the
posterior cord
the upper subscapular nerve courses into the
subscapularis muscle
the upper subscapular nerve supplies the
subscapularis muscle
The thoracodorsal nerve originates from the
posterior cord
The thoracodorsal nerve courses ___ and ____ to the deep surface of the ___
inferiorly and posteriorly; latissimus dorsi
What does the thoracodorsal nerve innervate?
latissimus dorsi
The lower subscapular nerve originates from the
posterior cord
The lower subscapular nerve courses over the ___ and divides into two muscular branches
anterior surface of the subscapularis muscle
The lower subscapular nerve divides into two muscular branches, one supplying the ____ and the other supplying the ____
subscapularis muscle; heres major muscle
the axillary nerve originates from the
posterior cord
the axillary nerve courses ___ through the _____. It passes medial to the ____
inferiorly; quadrangular space of the shoulder; surgical neck of the humerus
The axillary nerve innervates
teres minor and deltoid muscles
The musculocutaneous nerve is the continuation of the ______ of the brachial plexus.
lateral cord
The musculocutaneous nerve begins after the ______ is given off
lateral root to the median nerve
The unlar nerve is a continuation of the _____ of the brachial plexus
medial cord
The ulnar nerve begins after the ____ is given off
medial root to the median nerve
The radial nerve is the continuation of the ____ of the brachial plexus
posterior cord
The radial nerve begins after the ____ is given off
axillary nerve
The median nerve is derived from the ____ of the _____ and the ____ of the ____
lateral root of the median nerve and the medial root of the median nerve.
