B5 GA PKT 3: POSTERIOR COMPARTMENT OF THE THIGH & POPLITEAL FOSSA

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MM. OF THE POSTERIOR COMPARTMENT OF THE THIGH

BICEPS FEMORIS
SEMITENDINOSUS
SEMIMEMBRANOSUS

ALL MM. OF THE POSTERIOR COMPARTMENT OF THE THIGH ARE INNERVATED BY WHAT N.?

TIBIAL DIVISION OF SCIATIC N.
EXCEPT THE SHORT HEAD OF BICEPS FEMORIS, WHICH IS SUPPLIED BY THE COMMON FIBULAR DIVISION OF THE SCIATIC N.

BICEPS FEMORIS ORIGIN AND INSERTION

LONG HEAD: ISCHIAL TUBEROSITY
SHORT HEAD: LINEA ASPERA AND LATERAL SUPRACONDYLAR LINE OF FEMUR

INSERTION: TWO HEADS JOIN AND COMMON TENDON INSERTS INTO THE HEAD OF THE FIBULA

NERVE SUPPLY AND ACTION OF BICEPS FEMORIS

LONG HEAD: TIBIAL DIVISION OF SCIATIC N.
SHORT HEAD: COMMON FIBULAR DIVISION OF SCIATIC N.

ACTION:
BOTH HEADS: FLEXION & LATERAL ROTATION OF LEG @ KNEE JOINT
LONG HEAD ONLY: EXT OF THIGH @ HIP JOINT

SEMITENDINOSUS ORIGIN AND INSERTION

ISCHIAL TUBEROSITY --> BY A LONG TENDON INTO THE UPPER PART OF MEDIAL SURFACE OF THE SHAFT OF THE TIBIA

EXPANDED TENDONS OF SARTORIUS, GRACILIS, AND SEMITENDINOSUS (CLOSE TO THEIR TIBIAL INSERTIONS) ARE REFERRED TO AS WHAT?

PES ANSERINUS (SIMILAR TO A GOOSE FOOT)

NERVE SUPPLY AND ACTION OF SEMITENDINOSUS M.

N: TIBIAL DIVISION OF SCIATIC N.
A: FLEXION & MEDIAL ROTATION OF LEG @ KNEE JT
EXT OF THIGH @ HIP JOINT

SEMIMEMBRANOSUS ORIGIN AND INSERTION

O: ISCHIAL TUBEROSITY
I: POSTERIOR ASPECT OF MEDIAL CONDYLE OF TIBIA

TENDON GIVES RISE TO FIBERS THAT REINFORCE POSTERIOR ASPECT OF THE CAPSULE OF THE KNEE JOINT--> "OBLIQUE POPLITEAL LIGAMENT"

NERVE SUPPLY AND ACTION OF SEMIMEMBRANOSUS

N: TIBIAL DIVISION OF SCIATIC N.

A: FLEXION & MEDIAL ROTATION OF LEG @ KNEE JT
EXTENSION OF THIGH @ HIP JOINT

MAJOR A. IN THE POSTERIOR COMPARTMENT OF THE THIGH

NONE

MAIN SOURCE OF BLOOD SUPPLY OF THE POSTERIOR COMPARTMENT OF THE THIGH

PERFORATING BRS. OF PROFUNDA FEMORIS A.

SCIATIC N.

as it leaves gluteal region, it passes deep to long head of biceps femoris

descends along midline of posterior thigh, overlapped posteriorly by adjacent margins of biceps femoris and semimembranosus

SCIATIC N. IS RELATED ANTERIORLY TO WHAT M?

ADDUCTOR MAGNUS M.

IN THE LOWER THIRD OF THE THIGH, SCIATIC N. ENDS BYH DIVIDING INTO

tibial and common fibular (peroneal) nerves (division may occur at higher level)

BRS. OF SCIATIC N. IN THE POSTERIOR THIGH

tibial n.
common fibular n.
muscular branches

the muscular brs. of sciatic n. are to what mm.?

long head of biceps femoris
semitendinosus
semimembranosus
hamstring part of adductor magnus (from tibial division) short head of biceps femoris (from common fibular division)

what is the diamond shaped space located posterior to the knee joint

popliteal fossa

boundaries of the popliteal fossa

superolateral: biceps femoris

superomedial: semitendinosus and semimembranosus

inferolateral: lateral head of gastrocnemius and plantaris

inferomedial: medial head of gastrocnemius

floor and roof of the popliteal fossa

anterior wall (floor): popliteal surface of femur, posterior aspect of knee joint (articular capsule), popliteus muscle

posterior wall (roof): skin and fasciae (superficial and deep)

contents of the popliteal fossa

popliteal a. & v.
terminal part of small saphenous v.
tibial and common fibular nn.
terminal part of posterior cutaneous n. of thigh
genicular branch of obturator n. (terminal part of its posterior branch)
popliteal lymph nodes

what a. begins at the adductor hiatus as a continuation of femoral a.?

popliteal a.

popliteal a. terminates where?

at inferior border of popliteus muscle by dividing into anterior and posterior tibial arteries

popliteal a. is located where in the popliteal fossa?

it's the most deeply located structure in the popliteal fossa
lies in contact with fossa's floor

popliteal vein lies posterior and slightly lateral to popliteal artery
tibial nerve lies posterior and slightly lateral to popliteal vein **(AVN from anterior to posterior)

brs. of popliteal a.

muscular brs. (to gastrocnemius, soleus, plantaris, and distal pts of hamstring mm.)

genicular brs. (supply knee joint)--
2 superior (medial and lateral)
2 inferior (medial and lateral)
1 middle

popliteal v. is formed by the union of what vv.?

anterior and posterior tibial vv. @ inferior border of popliteus m.

popliteal v. terminates where?

@ adductor hiatus, where it becomes femoral v.

popliteal v. route

ascends through popliteal fossa posterior and slightly lateral to popliteal artery, and anterior and slightly medial to tibial nerve

tributaries of popliteal v.

veins that correspond to branches of popliteal artery
small saphenous vein

popliteal lymph nodes

embedded in connective tissue and fat of popliteal fossa

receive superficial lymph vessels from lateral part of foot and leg (accompany small saphenous vein)

receive deep lymph vessels accompanying anterior and posterior tibial vessels (drain all deep structures of foot and leg)

efferent vessels from popliteal lymph nodes accompany popliteal and femoral vessels and terminate in deep inguinal lymph nodes

what n. originates in the lower 1/3 of the thigh from sciatic n.?

tibial n.

tibial n.

descends almost vertically through popliteal fossa, posterior and slightly lateral to popliteal artery and vein

leaves popliteal fossa and enters posterior compartment of leg by passing deep (anterior) to tendinous arch of soleus muscle

tibial n. brs. (in the popliteal fossa)

muscular branches for medial and lateral heads of gastrocnemius, soleus, plantaris, and popliteus

articular branch to knee joint

medial sural cutaneous nerve

medial sural cutaneous nerve is joined by what n.

joinedc by sural communicating br. from lateral sural cutaneous n. to form --> sural n.

sural n. accompanies what?

small saphenous v.

sural n.

accompanies small saphenous vein -->descends between 2 heads of gastrocnemius and posterior to calcaneal tendon -->passes posterior and then inferior to lateral malleolus --> continues along lateral border of foot and little toe

sural n. supplies

skin over posterolateral aspect of leg
lateral border of foot
little toe

common fibular (peroneal) n. originates where?

originates in lower 1/3 of thigh from sciatic nerve

common fibular (peroneal) n. route

runs inferiorly and laterally in popliteal fossa, following medial border of biceps femoris

leaves popliteal fossa by passing superficial to lateral head of gastrocnemius

passes lateral to fibular neck, deep to fibularis longus muscle (common injury site), and divides into 2 terminal branches

2 terminal brs. of common fibular (peroneal) n.

superficial and deep fibular nerves

brs. of common fibular (peroneal) n. in the popliteal fossa

lateral sural cutaneous nerve:
supplies skin of upper lateral part of leg
gives off sural communicating branch that joins medial
sural cutaneous nerve to form sural nerve

articular branch--> to knee joint

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