Posterior Thigh Muscles Flashcards Preview

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Flashcards in Posterior Thigh Muscles Deck (39)
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1

Muscles that make up the posterior thigh

semitendinosus
semimebranosus
biceps femoris

all compose the hamstring

2

semitendinosus

function
innervation

begins 2/3 of way down thigh

extends thigh, medially rotates and flexes leg
tibial division of sciatic nerve

3

General function of all the hamstring muscles

thigh extensions (except short head of biceps femoris)
flexes above the knee

leg extension

4

general innervation of all hamstring muscles

tibial decision of sciatic (except biceps femoris)

5

semitendinosus attachements

ischial tuberosity and medial surface of superior aspect of tibia

6

semimembranosus

function innervation

extends thigh, flexes leg

tibial division of sciatic nerve

7

hamstring attachments (common origin)

ischial tuberosity

8

two parts of semimembranosus

based on insertion on the distal tendon

divides into parts that go to the medial tibial condyle and part that blends with popliteal fascia to become the oblique popliteal ligament

9

oblique popliteal ligament

reinforces the intercondyler part of joint capsule of knee

10

biceps femoris long head

function and innervation

flexes leg, extends thigh

tibial division of sciatic nerve

11

biceps femoris is different from rest of hamstrings because

has two parts with two different innervations

12

biceps femoris short head

function and innervation

flexes leg

common fibular branch of sciatic nerve

13

adductor magnus (hamstring portion) function and innervation

extends thigh, tibial division of sciatic nerve

medial and superior to most other hamstring and thigh muscles

14

diamond shaped region posterior to knee

popliteal fossa

15

list 4 boundaries of political fossa

1. superomedially
2. superolaterally
3. inferolaterally
4. inferomedially

16

contents of political fossa

nerves
popliteal vein, lymph nodes and branches
popliteal artery and branches

17

superomedial boundary of popliteal fossa

semitendinosus and semimebranosus

18

superolateral boundary of popliteal fossa

biceps femoris

19

inferolateral boundary of popliteal fossa

lateral head of gastrocnemius

20

inferomedial boundary of popliteal fossa

medial head of gastrocnemius

21

where does popliteal artery arise?

from femoral artery after passage through adductor hiatus

22

attachments of biceps femoris

long head (ischial tuberosity)
short head (distal lateral lip of linea aspera)

common insertion on head of fibula

23

attachment of adductor magnus (hamstring portion)

origin: ischial tuberosity

insertion: medial epicondyle of femur

24

deepest structure of popliteal fossa

popliteal artery

25

anastomoses of popliteal artery is via

genicular branches that run close to knee joint capsule

26

Arteries that compose the genicular anastomosis

superior lateral genicular artery
inferior lateral genicular artery
superior medial genicular artery
inferior medial genicular artery

27

what joins the genicular branches

descending branch of lateral femoral circumflex artery

joins it when coming from top of hip

provides alternative blood route to leg should femoral artery become occluded

28

what do the genicular branches supply

capsule and ligaments of knee joints

29

why would blood bypass popliteal artery?

knee is fully flexed too long

narrowed or occluded popliteal vessels

30

termination of popliteal artery

divides into anterior and posterior tibial arteries