Anatomy Memorization pt 2

Question 1

Intrinsic Laryngeal muscles innervation and exception

Answer 1

Supplied by recurrent laryngeal nerve except cricothyoroid = external laryngeal nerve (branch of superior laryngeal nerve)

Question 2

Cricotyhroid Muscle

Action
Innervation

Answer 2

Stretches and tenses vocal fold

External Laryngeal Nerve

Question 3

Posterior Cricoarytenoid

Action
Innervation

Answer 3

Abducts vocal fold

Recurrent laryngeal Nerve

Question 4

Lateral cricoarytenoid

Action
Innervation

Answer 4

Adducts vocal fold

Recurrent laryngeal Nerve

Question 5

Thyroarytenoid

Action
Innervation

Answer 5

Relaxes vocal fold

Recurrent Laryngeal Nerve

Question 6

Transverse and oblique arytenoids

Action
Innervation

Answer 6

Closes rima glottides

Recurrent Laryngeal Nerve

Question 7

Vocalis

Answer 7

Relaxes posterior vocal ligament, tenses anterior vocal ligament - Antagonist of cricothyroid muscle

Recurrent laryngeal nerve

Question 8

Recurrent Laryngeal Nerve

Answer 8

Left = Wraps around aortic arch (ligamentum arteriosum)
Right = Wraps around right subclavian

Motor to all intrinsic muscles of larynx (via inferior laryngeal branch) except cricothyroid

Sensory = laryngeal mucosa below vocal folds and upper trachea

Question 9

Superior Laryngeal Nerve

Answer 9

Branch of vagus right after exit from jugular foramen

Passes through thyrohyoid membrane

External branch = Innervates cricothyroid

Internal branch sensory info to laryngeal mucosa above vocal folds

Question 10

Contents of Axilla

Answer 10

Axillary Vessels

Brachial Plexus

Biceps Brachii (both heads)

Coracobrachialis

Question 11

Axillary Artery

Answer 11

After lateral border of first rib (continuation of subclavian)

Close to medial cord of brachial plexus

Posterior to pec minor muscle

Becomes brachial artery after passing inferior border of teres major

Question 12

Median Nerve (Brachial Plexus)

Answer 12

Lateral and medial cords
C5-T1

Motor = Forearm flexors

Sensory = Anterior arm, lateral palm

Question 13

Ulnar Nerve (Brachial Plexus)

Answer 13

Medial Cord
C8-T1

Flexors of wrist and fingers = Motor

Sensory = Medial arm/forearm, medial palm

Question 14

Radial Nerve (Brachial Plexus)

Answer 14

Posterior Cord
C6-C8

Extensors of arms/forearm = motor

Sensory = posterior arm, forearm hand

Question 15

Musculocutaneous Nerve (Brachial Plexus)

Answer 15

C5-C7

Motor = Arm flexors (Biceps, coracobrachialis, brachialis)

Sensory = Anterolateral arm, forarm

Question 16

A-alpha nerve fiber

Answer 16

Fastest and biggest

Proprioception and Motor

Question 17

A-Beta nerve fiber

Answer 17

2nd Fastest and 2nd Biggest

Sensory, Touch, Pressure

Question 18

A-gamma Nerve Fiber

Answer 18

3rd fastest and 3rd Biggest

Muscle Spindles

Question 19

A-sigma nerve fiber

Answer 19

4th Fastest and 4th Biggest

Sharp Pain, temperature, touch

Question 20

B-fiber nerve fiber

Answer 20

5th Fastest and 5th Biggest

Preganglionic autonomic

Question 21

C-Fiber Nerve Fiber

Answer 21

Slowest

Dull pain, temperature, postganglionic autonomic

Only non-myelinated