Lab 9: Nervous System I Flashcards
List the layers of the meninges in order from most superficial to most deep
1) Dura mater
2) Arachnoid mater
3) Pia mater
The empty space between the pia and arachnoid mater is called what?
The subarachnoid space
What is the function of the subarachnoid space?
To circulate CSF (cerebrospinal fluid)
Name the 4 plexuses and where they’re located
1) Cervical: C1-5
2) Brachial: C5-T1
3) Lumbar: L1-4
4) Sacral: L4-S4
What nerve is a part of the cervical plexus?
Phrenic nerve
What 4 nerves are a part of the brachial plexus?
Axillary
Radial
Median
Ulnar
What 2 nerves are a part of the lumbar plexus?
Femoral and obturator
What 2 nerves are a part of the sacral plexus?
Sciatic and pudenal
What muscle does the phrenic nerve act on, and what does that muscle do?
The diaphragm, the contraction of which causes inhalation
What 2 muscles are innervated by the axillary nerve, and what do they do?
1) Deltoid: abduction of the arm
2) Teres minor: rotates the humerus laterally
What nerve is known to be very short?
The axillary nerve
What nerve is located on the posterior arm?
The radial nerve
What nerve is located on the middle of the forearm?
Median nerve
What 5 muscles are innervated by the radial nerve, and what do they do?
1) Triceps brachii: extension of the forearm
2-5) Extensor carpi radialis brevis, extensor carpi radialis lungs, extensor carpi ulnaris, and extensor digitorum: extension of the wrist
What 4 muscles are innervated by the median nerve, and what do they do? (hint: one muscle serves 2 functions)
1-3) Flexor carpi radialis, palmaris longus, and flexor digitorum: flexion of the wrist
3) Flexor digitorum: flexion of the fingers
4) Pronator teres: pronation
What muscle is innervated by the ulnar nerve, and what does it do?
Flexor carpi ulnaris: flexion of the wrist
What 5 muscles are innervated by the femoral nerve, and what do they do? (hint: one muscle has 2 functions)
1-4) Vastus lateralis, vastus medius, vastus intermedius, and rectus femoris: extension of the knee
4) Rectus femoris: flexion of the hip
5) Sartorius: flexus, abducts, and laterally rotates the hip
What 3 muscles are innervated by the obturator nerve, and what is their function?
Gracilis, adductor longus, and adductor magnus: adduction of the hip
What nerve travels the anterior thigh?
Femoral nerve
What nerve innervates only adductors?
Obturator nerve
What nerve travels down the posterior thigh?
Sciatic nerve
What nerve is best described as short and located in the pelvis?
Pudenal nerve
What 3 muscles are innervated by the sciatic nerve, and what are their functions?
Biceps femoris, semitendinosus, and semimembranosus: extension of the hip and flexion of the knee
What 2 muscles are innervated by the pudenal nerve, and what do they do?
1) External urethral sphincter: voluntary control of urination
2) External anal sphincter: voluntary control of defecation
What plexuses innervate the torso and above?
Cervical and brachial
