PNS LEC Flashcards
(62 cards)
1
Q
- Supplies the gracilis, adductor brevis and longus, obturator
externus, pectineus, adductor magnus mm. - Supplies the skin on the medial surface of thigh
- Articular branches to the hip and knee jts.
A
Obturator N. (L2-L4)
2
Q
- Innervates the mm of the perineum, mucous membrane of the lower half of
the anal canal, perianal skin, skin of penis, scrotum, clitoris, and labia majora
and minora.
A
Pedundal Nerve (S2-S4)
3
Q
- Supplies the skin over the post. surface of the thigh, popliteal fossa, lower
part of the buttocks, scrotum, or labia majora (labium majus)
A
Posterior cutaneous nerve of the thigh (S1-S3)
4
Q
- Supplies the cremaster mm. in the scrotum
- Supplies the skin over the ant. surface of the thigh
- Nervous pathway for the cremasteric reflex
A
Genitofemoral N. (L1-L2)
5
Q
Supplies the skin over the shoulder region
A
Supraclavicular N. (C3-C4)
6
Q
Pericardium, mediastinal parietal pleura, and pleura
and peritoneum covering central diaphragm
A
Sensory Phrenic N.
7
Q
- Innervate the paravertebral muscles, posterior parts of the vertebrae, and
overlying cutaneous areas
A
Posterior rami
8
Q
- Supplies the back of the scalp and the auricle
A
Lesser Occipital N. (C2)
9
Q
Innervates the ant. neck muscles and the diaphragm
A
(phrenic
nerve)
10
Q
- Formed in the post. triangle of the neck by the union of the
ant. rami of the C5-T1 - Emerges between the anterior and middle scalene muscles,
passes deep to the clavicle, and enters the axilla - Radial, axillary, ulnar, median, and musculocutaneous nn.
- Innervates the entire upper limb.
A
Brachial Plexus
11
Q
- Supplies the rhomboid minor and major, levator scapulae mm.
A
Dorsal Scapular N.
12
Q
- Supplies the mm. of the ant. abdominal wall
- Supplies the skin of:
- upper medial aspect of the thigh
- Root of the penis and scrotum (males)
- Mons pubis and labia majora (females)
A
Ilioinguinal N. (L1)
13
Q
innervates the hamstring mm, gastrocnemius, soleus,
plantaris, popliteus, tibialis post., FDL, FHL,
A
Tibial Portion
14
Q
Repolarization Stage
A
- Rapid diffusion of K+ ions to the exterior
- Reestablishes the normal negative RMP
15
Q
- Supplies most of the flexor mm.
- Supplies the skin of palmar and dorsal aspect of the hands
A
. Median Nerve and Ulnar Nerve
16
Q
Depolarization Stage
A
- Polarized state is immediately neutralized by the inflow of Na
ions (becomes positively charge) - Occurs at the initial segment of the axon
17
Q
- Supplies the skin of the medial side of arm
A
Medial Cutaneous N. of the arm
18
Q
- Supplies the subclavius mm.
A
Nerve to the subclavius
19
Q
- Exhibits a myotomal and/or
dermatomal distribution
A
Spinal Lesions
20
Q
omohyoid, sternohyoid, sternothyroid
A
C1-C3 with Ansa cervicalis
21
Q
- Encloses the entire nerve trunk
A
Epineurium
22
Q
- Supplies the subscapularis mm.
A
Upper Subscapular N.
23
Q
- Supplies the iliacus, pectineus, sartorius, quadratus femoris (QF)
mm. - Intermediate cutaneous branches supplies the skin of:
- Ant. surface of the thigh
A
Femoral N. (L2-L4)
24
Q
Resting Stage
A
- RMP (-80 mV) before the action potential begins
- The membrane is “polarized”
- Maintained by the Na-K pump
25
* Separates individual axons
Endoneurium
26
* Surrounds the epineurium
Mesoneurium
27
* Innervates obturator internus and superior gemellus muscles
Nerve to the obturator internus (L5-S2)
28
* Innervates the short head of BF, TA, EHL, EDL, EDB
* Supplies the skin on the cleft between the 1
st and 2
nd toes
Common Peroneal Portion
29
* Innervates Gluteus medius, Gluteus minimus, and Tensor Fascia Latae
mm.
Superior Gluteal N. (L4-S1)
30
* Exhibits a peripheral nerve (PN)
distribution
* Paresis/paralysis
* Sensory loss
* Abnormal sensations
* Muscle atrophy
* Reduce or absent tendon reflexes
Peripheral Lesions
31
* Supplies the skin of the ant. and lat. surfaces of the thigh; peritoneum
Lat. Cutaneous n. of the thigh (L2-L3)
32
* Innervate the skeletal, muscular, and cutaneous areas of the limbs and the
anterior and lateral trunk
Anterior rami
33
* Supplies the skin over medial aspect of the buttock
Perforating cutaneous nerve (S2-S3)
34
* Supplies the subscapularis and teres major mm.
Lower Subscapular N.
35
Supplies the skin over the front of the neck
Transverse Cervical N. (C2-C3)
36
innervates the muscles on the sole of
the foot
Medial and lateral plantar branches:
37
* Supplies the pectoralis major and minor mm.
Medial Pectoral N
38
Supplies the skin of the medial side of the forearm
Medial Cutaneous N. of the forearm
39
* Supplies the mm. of the ant. abdominal wall
* Supplies the skin over the lower ant. abdominal wall and buttocks
. Iliohypogastric N. (T12-L1)
40
* Supplies the serratus anterior mm
Long Thoracic N.
41
innervates the peroneus longus and brevis mm, and supplies the
skin over the lower 3
rd of the ant. surface of the leg and dorsum of the foot
Superficial
42
Innervates piriformis
Nerve to the piriformis (S1-S2)
43
skin of the medial side of the leg and foot
Saphenous branch:
44
Surrounds bundles of axons
called fascicles
Perineum
45
* Supplies the pectoralis major mm.
Lat. Pectoral N.
46
* Innervates Gluteus maximus
Inferior Gluteal N. (L5-S2)
47
* Arises form the ant. rami of C1 to C4
* Lies deep to the sternocleidomastoid(SCM) mm.
* Provides cutaneous sensory information from the post. scalp to
the clavicle
Cervical Plexus
48
Thyrohyoid, geniohyoid
C1 fibers via CN 11
49
* Supplies the deltoid, and teres minor mm.
* The upper lat. cutaneous nerve of the arm supplies the skin over the lower half of
the deltoid mm.
. Axillary Nerve
50
* Supplies the latissimus dorsi mm.
Thoracodorsal N.
51
* Formed by the anterior rami of the L4-S4
* Found on the post. pelvic wall in front of the piriformis mm.
* Innervates the post. thigh and most of the leg and foot
* Contains parasympathetic axons in addition to the
somatosensory and somatic motor axons
Sacral Plexus
52
* Formed by the anterior rami of the L1-L4
* Forms in the psoas major mm.
* Innervates the skin and muscles of the anterior and medial
thigh
Lumbar Plexus
53
diaphragm,
Phrenic N. (C3-C5)
54
* Supplies the coracobrachialis, biceps brachii, brachialis mm.
* Supplies the skin along the lat. border of the FA when it becomes the lat. cutaneous
n. of the FA
Musculocutaneous Nerve
55
levator scapulae, trapezius
C3-C4
56
* Supplies most of the extensor mm. of the hand, arm, and FA
* Supplies the skin on the lat. side of the dorsum of hand, and dorsal
surface of the lateral three and a half fingers
* Articular branches to the elbow, wrist, and hand
Radial Nerve
57
: innervates the skin on the lat. side of the leg and foot
Sural branch:
58
* Supplies the skin over the angle of the mandible
Greater Auricular N. (C2-C3)
59
* Supplies the supraspinatus and infraspinatus mm.
Suprascapular N.
60
prevertebral muscles, SCM
C2-C3
61
*Includes all neural structures distal to the spinal
nerves
* Sensory, motor, and autonomic neurons
PNS
62
* Supplies the quadratus lumborum and psoas mm
Segmental branches
