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1

Observable features of thigh

Slide 2

Vastus Lateralis

Vastus Medialis

ETC... Check out that Femoral Triangle.... Oh Baby!

2

Three of the four muscles that constitute the quadriceps femoris muscle group can be identified:
(Except on your legs ya pansy)

Rectus femoris

Vastus lateralis

Vastus medialis

3

The fourth muscle of the group, the __ ___, is deep to the above three

vastus intermedius

4

Sartorius

on slide 4

is it getting hot in here?

5

The _______ is the aponeurosis of the tensor fasciae lata plus the gluteus maximus muscles

iliotibial tract

6

The iliotibial tract is the aponeurosis of the __ plus __

tensor fasciae lata plus the gluteus maximus muscles

7

is the most lateral structure of the thigh

The iliotibial tract

8

Three compartments of the thigh

Anterior

Posterior (hamstrings)

Medial (Adductor)

9

Extensors at the knee, flexion at the hip
Innervation (free appendage muscles): femoral nerve

Anterior compartment

10

Adductors of the hip

Innervation: obturator (almost all)

Medial compartment (Adductor group)

11

Flexors at the knee, extensors at the hip

Innervation: tibial nerve (almost all) {tibial division of sciatic nerve, which is why some references state sciatic and some state tibial nerve}

Posterior compartment (‘Hamstrings’)

12

Look at Slide 7 for an image of the 3 compartments of the thigh

You will need to know this well

13

Anterior compartment of thigh

List them all!

Pectineus*
Illiopsoas*: psoas major, psoas minor, iIliacus
Sartorius
Quadriceps femoris: rectus femoris, vastus lateralis, vastus medialis, vastus intermedius


* Since these are not within the free appendage, they are often not considered muscles of the thigh, or they may be categorized as “extrinsic” muscles of the thigh

14

Semitendinosus
Semimembranosus
Biceps femoris

Posterior compartment (‘Hamstrings’)

* Since these are not within the free appendage, they are often not considered muscles of the thigh, or they may be categorized as “extrinsic” muscles of the thigh

15

Pectineus*
Adductor longus
Adductor brevis
Adductor magnus
Gracilis
Obturator externus*

Medial compartment (Adductor group)

* Since these are not within the free appendage, they are often not considered muscles of the thigh, or they may be categorized as “extrinsic” muscles of the thigh

16

Pectineus*
Illiopsoas*: psoas major, psoas minor, iIliacus
Sartorius
Quadriceps femoris: rectus femoris, vastus lateralis, vastus medialis, vastus intermedius

Anterior compartment

* Since these are not within the free appendage, they are often not considered muscles of the thigh, or they may be categorized as “extrinsic” muscles of the thigh

17

Posterior compartment of thigh

List them all!

Semitendinosus
Semimembranosus
Biceps femoris

18

Medial compartment of thigh

List them all!

Pectineus*
Adductor longus
Adductor brevis
Adductor magnus
Gracilis
Obturator externus*

19

Which muscle is transitional between the anterior and medial compartments?

Pectineus*

* Since these are not within the free appendage, they are often not considered muscles of the thigh, or they may be categorized as “extrinsic” muscles of the thigh

20

What are the "extrinsic" muscles of the thigh?

Pectineus*

Illiopsoas*

Obturator externus*

21

Slide 9 image

take a gander

22

Slide 10 image

take a gander

23

Slide 11 image

take a gander

24

Thigh muscles illustrated: illiopsoas (psoas + illiacus), sartorius, plus tensor of the fascia lata

slide 11

take a looksy

25

Origin: anterior superior iliac spine (ASIS)
Insertion: pes anserine tendon at upper tibia

Action: Flexes, abducts, and laterally rotates femur at the hip joint, and flexes leg at the knee

Innervation: femoral nerve

Supplemental: longest muscle in the body, it is also known as the tailor’s muscle; upper portion forms lateral border of the femoral triangle

Sartorius

26

Sartorius

O

A

I

S

Origin: anterior superior iliac spine (ASIS)
Insertion: pes anserine tendon at upper tibia

Action: Flexes, abducts, and laterally rotates femur at the hip joint, and flexes leg at the knee

Innervation: femoral nerve

Supplemental: longest muscle in the body, it is also known as the tailor’s muscle; upper portion forms lateral border of the femoral triangle

27

longest muscle in the body, it is also known as the tailor’s muscle; upper portion forms lateral border of the femoral triangle

sartorius

28

Iliopsoas

O

A

I

S

Origin:
---Psoas major: transverse processes and bodies of lumbar vertebrae
---Iliacus: iliac fossa (of ilium) and sacrum

Insertion: lesser trochanter of femur

Action: Flex the torso and thigh with respect to each other, rotate thigh laterally

Innervation:
--Psoas: lumbar spinal nerves
--Iliacus: femoral nerve

29

Origin:
---Psoas major: transverse processes and bodies of lumbar vertebrae
---Iliacus: iliac fossa (of ilium) and sacrum

Insertion: lesser trochanter of femur

Action: Flex the torso and thigh with respect to each other, rotate thigh laterally

Innervation:
--Psoas: lumbar spinal nerves
--Iliacus: femoral nerve

Iliopsoas

30

Origin: anterior superior iliac spine (ASIS) and iliac crest

Insertion: tibia by way of iliotibial tract (iliotibial band (ITB))

Action: flexes, abducts, and medially rotates thigh at hip joint; helps stabilize and steady the hip and knee joints by putting tension on the iliotibial band of fascia

Innervation: superior gluteal nerve

Tensor Fasciae Latae