Exam (elaborations)
Anatomy Exam 1 - Muscles, Organs, Innervations.
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- Accounting 405
- Institution
- Accounting 405
Anatomy Exam 1 - Muscles, Organs, Innervations.
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Anatomy Exam 1 - Muscles, Organs,Innervations
Pectoralis Major - Action - ANS-Flexion, adduction, medial rotation, & horizontal
adduction of ARM
Pectoralis Major M. - Innervation/Blood Supply - ANS-nerves:
medial pectoral n. (C8-T11)
lateral pectoral n (C5-C7)
artery:
thoracoacromial trunk (pectoral branch)
breast tissue - ANS-deep fascia on anterior surface of pectoralis maj., fused to facia of
mammary gland
Pectoralis Minor - Action - ANS-protraction, medial rotation, & downward movement of
scapula (pulls it forward)
Pectoralis Minor - Innervation/Blood Supply - ANS-medial pectoral n. (C8-T1)
Diaphragm - Action - ANS-increases volume of thoracic cavity for inspiration (pushes
abdominal viscera inferiorly)
Diaphragm - Blood Supply - ANS-musculophrenic, superior phrenic, & inferior phrenic a.
Diaphragm: L & R Crus - ANS-L crus - attaches to L1-L2, R crus attaches to L1-L3
Intercostals - Innervation/Artery - ANS-Intercostal n. (T1-T11)
Intercostal a.
External intercostals - action - ANS-elevates ribs (up) -> inspiration
Internal intercostals - action - ANS-depress ribs (down) -> expiration, push air out of
lungs
Innermost Intercostals - action - ANS-assist breathing by depressing ribs + support
integrity of thoracic cage
, run deep to VAN bundle
sternocleidomastoid - action - ANS-bilateral - neck/head flexion + extension
unilateral - rotates head + lateral flexion of neck
sternocleidomastoid - nerves/arteries - ANS-accessory n. (CN XI), anterior rami C2-C4
occipital a., posterior auricular a., superior thyroid a., & suprascapular a.
scalenes - action - ANS-neck lateral flexion, elevation of 1st + 2nd ribs
scalenes - nerves/arteries - ANS-anterior & posterior scalenes - anterior rami C4-C6
medius scalenes - anterior rami C3-C8
ascending cervical a.
subclavius - action/nerves/arteries - ANS-clavicle stabilization
subclavian n.
thoracoacromial a. (clavicular), suprascapular a.
**Levator costarum - action/nerve/artery - ANS-elevates rib
dorsal (posterior) rami of spinal n. C8-T11
deep cervical a., intercostal a.
*Subcostalis - action/nerve/artery - ANS-compresses intercostal space by elevating ribs
subcostal n.
subcostal a.
*Transversus thoracis - action/nerve/artery - ANS-compresses thorax for forced
expiration -> depresses ribs (moves superior/laterally)
intercostal n. 2-6
internal thoracic a.
anterior intercostal v. drainage - ANS-drain to musculoprenic v. or directly into internal
thoracic v.
posterior intercostal aa. - ANS-first 2 = branches of superior intercostal a.
remaining branch from thoracic aorta
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