Anatomy pectoral region mcq study questions with answers
17 anatomy – pectoral region mcq question with answers
1. What’s another name for the superficial fascia?
2. What nerves make it possible for you to feel an itch on your chest? What path do those sensory impulses follow?
3. Name two structures that are extensions of the pia mater in the vicinity of the spinal cord.
4. What’s the most lateral component of the erector spinae complex?
5. At about what vertebral level does the spinal cord end? What’s the cone-shaped terminal part of the spinal cord called?
6. During mastectomy, what major nerve would you be most likely to sever (especially if you hadn’t paid enough attention in gross lab)? What condition would result from its damage?
7. Think about the chordate cross-sections (dogfish and human). What’s the relation of the heart to the gut? The dorsal aorta to the gut? What structures replace the notochord?
8. What does the cephalic vein feed into?
9. Can you see the insertion of the serratus anterior if the cadaver (with superficial fascia removed) is lying on its back?
10. Which nerve pierces the pectoralis minor muscle?
11. Why are the pectoral nerves called “medial” and “lateral”?
12. What innervates the pectoralis major m.? The pectoralis minor m.?
13. If the pectoralis major m. were completely removed, would the pectoralis minor m. serve as a good backup? Explain.
14. What artery do you expect to find running with the long thoracic n.? Where does the artery come from? Where does the long thoracic n. come from?
15. The brachial plexus forms from certain ventral rami. Does this mean that nerves from the plexus contain only motor fibers?
16. You found the lateral pectoral n. What artery do you expect to find near it? How can you be sure you have the correct artery?
17. They’ve pinned a nerve that runs parallel to and just under a rib. What is it? What layers of muscle or connective tissue does the nerve pass between? What other nerves does that nerve give rise to?
ANSWERS: pectoral region
2. ant. cutaneous n. (branch of intercostal n.); ant. cut. n., intercostal n., ventral ramus of spinal n., spinal
n., dorsal root (spinal) ganglion, dorsal root, dorsal horn
3. denticulate ligament and filum terminale
4. iliocostalis m.
5. L1 or L2; conus medullaris
6. long thoracic n.; winged scapula (from paralysis of serratus ant. m.)
7. ventral (ant.); dorsal (post.); vertebral bodies and intervertebral discs (nucleus pulposus)
8. axillary v.
9. yes; insertion is medial border of scapula (ant. surface) (origin is first 8 ribs)
10. medial pectoral n.
11. named for the cord of the brachial plexus from which is branches
12. both medial and lateral pectoral nerves
13. No, major inserts on humerus, minor on coracoid process of scapula. Different insertions, different actions.
14. lateral thoracic a.; axillary a; brachial plexus (C5,6,7)
15. No, only ventral roots contain only motor fibers. Plexus nerves are mixed.
16. pectoral br. of thoracoacromial a.; notice its origin (axillary a.) and where it goes (pec. maj. m.)
17. intercostal n.; betw. internal and innermost intercostal m.; lateral cutaneous br. and ant. cut. br.