5: Nerves Of The Neck And Larynx Flashcards
Superior vs inferior loop of ansa cervicalis
Superior: from C1
Inferior: from C2 and C3
Where is the white rami in the neck
There is none
Two options for fibers to pass to cervical spinal nerves in the neck
- Via gray rami
2. Leave as visceral branches into thorax
Locations of the three cervical ganglia
Superior: level of C1-2
Middle: over inferior thyroid A, around C6
Inferior ganglia: level of C7
Two places branches from superior cervical ganglion go?
- Cervical plexus
2. Cardiopulmonary branches
Distribution of middle cervical ganglia
Distributed via periarterial plexuses and cardiopulmonary splanchnic N’s
Where do fibers go from the inferior cervical ganglion
Brachial plexus, heart, or periarterial plexus of the vertebral A
Phrenic nerve relation to anterior scalene
Anterior to anterior scalene
Three unpaired laryngeal cartilages
- Thyroid cartilage
- Epiglottis
- Cricoid cartilage
Three paired laryngeal cartilages
- Arytenoid cartilages
- Corniculate cartilages
- Cuneiform cartilages
Level of thyroid cartilage
C4
Epiglottis cartilage type
Elastic cartilage
Cricoid cartilage level
C6
Function of arytenoid cartilages
Attaches vocal cords
Where are the vocal ligaments
Under the vocal cords
Vocal folds function
Make sound when air passes by due to elastic vocal ligaments
What two things do vocal folds run between?
Thyroid cartilage + arytenoid cartilages
How is voice volume determined?
Force of air
How is voice pitch determined
Tension of folds
What N regulates pitch of voice
CN 10
Ventricular folds
False vocal cords, do not contain vocal ligaments
What nerves innervate the larynx
All from CN 10: superior laryngeal N, inferior laryngeal N
Superior laryngeal N function
Sensory to inner larynx, motor to cricothyroid M
Inferior laryngeal N function
Motor to intrinsic laryngeal muscles
Two arteries that supply larynx
Superior laryngeal A (from superior thyroid) + inferior laryngeal A (from inferior thyroid)
