Innervation

Question 1

Somatic nervous system is made up of

Answer 1

Motor to skeletal muscle
Sensory from skin
Sensory from muscles, joints, and tendons

Question 2

Visceral sensory system takes care of

Answer 2

Sensory from visceral organs (ex: ischemia, stretch)

Question 3

Autonomic nervous system is comprised of

Answer 3

Parasympathetic and Sympathetic motor pathways which innervate cardiac muscle, smooth muscle, and glands

Question 4

Parasympathetic innervation takes care of what

Answer 4

Rest and digest, motor innervation

Question 5

Sympathetic innervation takes care of what

Answer 5

Fight or flight;
Motor to thoracic organs
Motor to abdominal organs
Motor to body wall

Question 6

What does each branch off the vertebra carry

Answer 6

Ventral root: motor only
Dorsal root: sensory only
Spinal nerve: motor and sensory
Dorsal/ventral rami: motor and sensory

Question 7

Sympathetic targets are in

Answer 7

Body wall- blood vessels, arrector pili muscles, sweat glands
Body cavities- heart, lungs, abdomen, and pelvis

Question 8

Sympathetic preganglionic cell bodies are in

Answer 8

Lateral horn of thoracolumbar vertebrae (T1-L3)

Question 9

Parasympathetic targets are in

Answer 9

Body cavities- organ walls
Head
External genitalia

Question 10

Parasympathetic preganglionic cell bodies are located in

Answer 10

Lateral horn of craniosacral vertebrae

Question 11

What are Intercostal nerves

Answer 11

Extensions of ventral rami of T1-T11

Question 12

What kind of fibers do intercostal nerves carry

Answer 12

Somatic motor to intercostal muscles
Somatic sensory to thoracic wall skin, joints, muscles, and tendons
Sympathetic motor to sweat glands, Arrector pilli, and blood vessels in the skin

Question 13

What fibers innervate the lungs

Answer 13

The vagus nerve provides parasympathetic to the walls of lungs (bronchoconstriction of smooth muscle) of bronchial tree) Sympathetic innervation is provided by pulmonary nerves (bronchodilation of smooth muscle of bronchial tree)

Question 14

What innervates the diaphragm

Answer 14

Phrenic nerve provides somatic sensory and somatic motor.

Intercostal nerves provide peripheral somatic sensory

Question 15

What does the phrenic nerve innervate in the thoracic cavity

Answer 15

Diaphragm- somatic motor and sensory
Parietal pleura- somatic sensory
Fibrous pericardium- somatic sensory
Parietal layer of serous pericardium- somatic sensory

Question 16

What do the splanchnic nerves provide

Answer 16

Greater, lesser, and least splanchnic nerves provide sympathetic innervation to abdominal organs

Question 17

What innervation does the heart receive

Answer 17

Vagus nerve provides parasympathetic to heart walls

Cardiac nerves provide sympathetic to heart walls

Question 18

What plexuses does the vagus nerve contribute to in the mediastinum

Answer 18

Cardiac plexus
Left and right pulmonary plexuses
Esophageal plexus

Question 19

What are the nerves of the abdominal wall and what do they provide

Answer 19

T7-T11 (extension of intercostal nerves)
T12 (extension of subcostal nerves)
L1 (iliohypogastric and ilioinguinal)
-They all provide somatic motor, somatic sensory, and sympathetic

Question 20

What does the ilioinguinal nerve do

Answer 20

(L1) Provides somatic sensory to the inguinal region, scrotum, and labia majora

Question 21

What does the genital branch of the genitofemoral nerve do

Answer 21

Provides somatic sensory innervation to the inguinal region, scrotum, and labia majora
Also provides motor to cremaster muscle