SACRAL PLEXUS Flashcards Preview

Anatomy (TOPNOTCH SUPPLEMENT) > SACRAL PLEXUS > Flashcards

Flashcards in SACRAL PLEXUS Deck (15):
1

Branches:

To the lower limb that leave the PELVIS through the GREATER SCIATIC FORAMEN

Sciatic (L4, L5, S1, S2 and S3)

Superior Gluteal (GLUTEUS MEDIUS/MINIMUS)

Inferior gluteal (GLUTEUS MAXIMUS)

Nerve to Quadratus femoris

Nerve to Obturator internus

Posterior cutaneous nerve of the thigh

2

Branches:

To the PELVIS MUSCLES, PELVIC VISCERA, and PERINEUM

Pudendal (S2, S3 and S4) - PERINEUM

Nerve to Piriformis

Pelvic Splanchnic nerves (S2, S3, and S4)

3

Supplies the skin on the lower medial part of the buttock

Perforating cutaneous nerve

4

Large nerve of the body

From L4-S3

Supplies NO structures in the gluteal region, skin of the foot and leg, posterior thigh muscles

SCIATIC NERVE

5

Results to weakened abduction of the thigh by gluteus medius

"wadding" gait, pelvis sags on the side of unsupported limb

(+) Trendelenburg sign

SUPERIOR GLUTEAL NERVE INJURY

6

Hip joint stability

Stability when a person stands on one leg with the foot of the opposite leg raised above the ground depends 3 factors

GLUTEUS MEDIUS and MINIMUS must be functioning normally

HEAD of the FEMUR must be located normally within the ACETABULUM

NECK of the FEMUR must be intact and must have a normal angle with the SHAFT of the FEMUR

7

Weakness in the ability to LATERALLY ROTATE and EXTEND THE THIGH AT HIP JOINT

Difficulty extending the thigh at the hip from a flexed position, as in CLIMBING STAIRS OR RISING FROM A CHAIR

Have a GLUTEUS MAXIMUS GAIT, in which patients thrust their torso posteriorly in an attempt to counteract the weakness of the gluteus maximus

INFERIOR GLUTEAL NERVE LESIONS

8

Susceptible to damage from an IM injection in the lower medial quadrant of the gluteus maximus muscle or it may be compressed as a result of a posterior dislocation of the femur

L5 and S1 roots are commonly compressed - pain radiates into the L5 and S1 derrmatomes of the leg and foot

SCIATIC NERVE LESIONS

9

Common site for intramuscular injections

Should be made on the SUPEROLATERAL PART OF THE BUTTOCK to avoid hitting nerves and vessels

INTRAGLUTEAL INJECTIONS

10

PIRIFORMIS MUSCLE irritates and places pressure on the SCIATIC NERVE causing pain in the buttocks and referring pain along the course of SCIATIC NERVE

PIRIFORMIS SYNDROME

11

Radiates down the back of thigh into the lower back

SCIATICA

12

May be damaged in the abdomen by an abscess of the PSOAS MAJOR

Weakness in the ability to flex the thigh at the hip

Weakness in the ability to extend the leg at the knee

Diminished PATELLAR TENDON REFLEX

FEMORAL NERVE LESIONS

13

May be lesioned during a surgical procedure of the leg to remove part of the great saphenous vein or may be lacerated as it pierces the wall of the adductor canal

Pain and Paresthesia in the skin of the medial aspect of the leg and foot

SAPHENOUS NERVE LESIONS

14

Most commonly lesioned in the pelvis

Patients are unable to adduct the thigh at the hip

Paresthesia in the skin of the medial thigh

OBTURATOR NERVE LESIONS

15

Lies on the POSTERIOR PELVIC WALL in front of the PIRIFORMIS MUSCLES

Formed by the ANTERIOR RAMI of L4 and L5 and S1-S4

NOTE: contribution from L4 joins L5 to form the LUMBOSACRAL TRUNK

Sacral plexus