Pectoral Girdle Flashcards
A of deltoid m.
abducts humerus, flexes, extends, and rotates humerus
N of deltoid m.
axillary n. (C5,C6) and posterior circumflex humeral vessels
A of teres major m.
medially rotates and extends humerus
can also contribute to adduction of humerus
N of teres major
lower (inferior) subscapular n. (C5-C7) and subscapular vessels
A of supraspinatus m.
abducts the humerus (1st 15 degrees)
assists deltoid up to 110 degrees
N of supraspinatus m.
suprascapular n. (C5, C6) and vessels; and dorsal scapular vessels
A of infraspinatus
laterally rotates the humerus
N of infraspinatus
suprascapular n. (C5, C6) and vessels; and subscapular vessels
A of teres minor m.
lateral rotation of humerus
N of teres minor
axillary n. (C5, C6) and suprascapular and subscapular vessels
A of subscapularis m.
medial rotation of humerus
N of subscapularis
upper and lower subscapular nn. and subscapular vessels
membranous sac containing lubricating synovial fluid
subacromial (subdeltoid) bursa
subacromial bursa inferior to ____ and ____, but superior to _____
acromion; deltoid; supraspinatus m.
subacromial (subdeltoid) bursa can become continuous with joint capsule due to attrition of _____
supraspinatus tendon
spaces of the shoulder region
quadrangular space
triangular space
triangular interval
quadrangular space holds:
axillary n. and posterior circumflex humeral vessels
triangular space holds:
circumflex scapular vessels
triangular interval holds:
radial n. and profunda brachii a. (deep brachial a.)
borders of quadrangular space
superior = teres minor m. inferior = teres major m. medial = long head of triceps brachii m. lateral = surgical neck of the humerus
borders of the triangular space
superior = teres minor m. inferior = teres major m. lateral = long head of triceps brachii m.
borders of triangular interval
superior = teres major m. medial = long head of triceps brachii m. lateral = lateral head of triceps brachii m.
the radial n. and deep brachial a. run in the ____ or ____ groove of the humerus
radial; spinal
neurovascular supply of the shoulder region
- suprascapular n. and a.
- dorsal scapular n. and deep transverse cervical a.
- accessory n. and superficial transverse cervical a.
- upper and lower subscapular nn. and subscapular a.
suprascapular n. originates in ____; runs under ____ through _____
ventral rami of C5-C6; superior transverse scapular ligament; suprascapular notch
suprascapular a. originates in ____ and runs ____ superior transverse scapular ligament above suprascapular notch
thyrocervical trunk; over
suprascapular n. and a. pass through ____ to infraspinatus fossa and supply ____ and _____ mm.
spinoglenoid notch; supraspinatus; infraspinatus
dorsal scapular n. originates in ____
ventral ramus of C5
dorsal scapular n. and deep transverse cervical a. run parallel to ____ of the scapula and supply ____ and ____ mm.
vertebral border; levator scapulae; rhomboid
accessory n. originates in the ____, descends through neck and joins artery
brainstem (XI)
superficial transverse cervical a. is a branch of the ____ and runs deep to the ____
thyrocervical trunk; trapezius m.
accessory n. and superficial transverse cervical a. supply ____ m.
trapezius
upper and lower subscapular nn. are branches off the posterior cord of the brachial plexus, ventral rami of ____
C5-C6
subscapular a. is a branch off the ____; subscapular a. splits to ____ and _____
axillary a. ; thoracodorsal a. ; circumflex scapular a.
upper and lower subscapular nn. and subscapular a. supply ____
subscapularis m.
lower subscapular n. and subscapular a. supply ____
teres major m.
ligated axillary a. should be between ____ and _____
thyrocervical trunk; subscapular a. (anywhere in axillary section 1 or 2)
ligate anywhere distal to ____ and blood cannot flow to UL
subscapular a.
A of pectoralis major
adducts and medially rotates humerus
N of pectoralis major
medial and lateral pectoral nn. and thoracoacromial vessels
A of pectoralis minor
protracts scapula
N of pectoralis minor
medial pectoral n. and thoracoacromial vessels
pectoral region arterial supply
- lateral thoracic (mammary) a.
- internal thoracic (mammary) a.
- thoracoacromial a.
lateral thoracic (mammary) a. is a branch off the 1st part of the ____ a. and runs posterior or deep to ____ m. and superficial to ____ m.
axillary; pectoralis minor; serratus anterior
lateral thoracic (mammary) a. runs with ____ to supply lateral thorax, lateral pec region, and lateral breast
long thoracic n.
internal thoracic (mammary) a. is a branch off the ____ inside the thorax
subclavian a.
internal thoracic (mammary) a. descends across intercostal spaces lateral to the ____ to supply anterior thorax, medial pec region and medial breast
sternum
thoracoacromial a. is a branch of the ____ under ____ m.
axillary a. ; pectoralis minor m.
4 branches of thoracoacromial a.
- pectoral a.- supplies upper pec region
- clavicular a. - supplies clavicle region
- acromial a. - supplies upper shoulder region
- deltoid a. - supplies lower shoulder region
pectoral region innervation
cutaneous nerves
medial pectoral nerve
lateral pectoral nerve
long thoracic nerve
pec region cutaneous nerves are from ____ and are lateral and anterior cutaneous branches of ____ nn.
T1-T6 ; intercostal
medial pectoral nerve is from the medial cord of the brachial plexus and derived from ventral rami ____
C8-T1
medial pectoral n. pierces ____ to enter ____; it supplies ____ and part of ____
pectoralis minor m. ; pectoralis major m. ; pec minor; pec major
_____ supplies the remainder of pectoralis major m.
lateral pectoral n.
lateral pectoral n. derived from _____
ventral rami C5-C7
lateral pectoral n. runs above ____ to enter ____
pectoralis minor; pectoralis major
long thoracic n. derived from ____
ventral rami C5-C7
long thoracic n. supplies _____ superficially (lies on the superficial surface)
serratus anterior
damage to long thoracic n. can occur during ____ and results in ____ because the long thoracic nerve holds UL to thoracic wall
mastectomy; “winged scapula”
