Week 4: Hip & Thigh Muscles 2 Flashcards

1
Q

Describe the action, innervation, and common blood supply of the anterior thigh compartment:

A

Action:
- Knee extension
- Hip flexion (rectus femoris)
Innervation: Femoral (L2-L4)
Blood supply: Deep femoral

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2
Q

Describe the action, innervation, and common blood supply of the posterior thigh compartment:

A

Action:
- Knee flexion
- Hip extension (except short head biceps femoris) +/- leg rotation
Innervation: Tibial (L4-S3)
- Short head of biceps femoris = common fibular
Blood supply: Deep femoral

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3
Q

Describe the action, innervation, and common blood supply of the medial thigh compartment:

A

Action: Adduction
Innervation: Obturator (L2-L4)
- Pectineus = femoral nerve
- Adductor magnus = obturator + tibial
Blood supply: Obturator + deep femoral

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4
Q

Describe the origin, insertion, position, and function of the sartorius:

A

Origin: ASIS
Insertion: Medial surface of upper part tibia, as part of the pes anserinus
Position: Long, ribbon like, passes inferio-medially
Function:
- Flexion
- Abduction
- Lateral rotation of the Hip
- Knee flexion

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5
Q

Describe the origin, insertion, position, and function of the rectus femoris:

A

Origin:
- Straight head: AIIS
- Reflected head: groove above the acetabular rim
Insertion: Base of patella via the quadriceps tendon and into the tibia via the patellar ligament
Position: Runs straight down the thigh, anterior to the hip and knee joints
Function:
- Knee extension
- Hip flexion

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6
Q

Describe the origin, insertion, position, and function of the vastus lateralis:

A

Origin: Femur via an aponeurosis which attaches to inter-trochanteric line and along the lateral lip of linea aspera, lateral IMS
Insertion:
- Superolateral border of patella via quadriceps tendon and to tibia via patellar ligament
- Lateral border of tibia via lateral patellar retinaculum
Position:
- Anterior to knee joint
- High pennation angle, large cross sectional area, short fibres
Function:
- Knee extension (powerful)

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7
Q

Describe the origin, insertion, position, and function of the vastucs medialis:

A

Origin: Medial lip linea aspera, distal ½ intertrochanteric line, medial IMS
Insertion:
- Superomedial border patella via quadriceps tendon, and tibial tuberosity via patellar ligament
- Medial condyle of tibia via medial patellar retinaculum
Position: Large muscle composed of two parts - longus and obliquus
Function:
- Knee extension
- Stabilisation of patella (against lateral displacement)

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8
Q

Describe the origin, insertion, position, and function of the vastus intermedius:

A

Origin: Femoral shaft from one lip of the linea aspera to the other, lateral IMS
Insertion: Upper border of patella via quadriceps tendon to tibial tuberosity via patellar ligament
Position: Deep to rectus femoris
Function: Knee extension

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9
Q

Describe how the muscles of the quadriceps femoris group converge and insert distally:

A
  • All muscles converge onto the quadriceps tendon in the distal thigh
  • Insert into the patella and patellar retinaculum - VM and VL
  • Insert into the tibial tuberosity via the patellar ligament/tendon – results in leg extensiom
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10
Q

Describe the architecture of the vastus medialis:

A
  • High pennation angle, large cross sectional area, short fibres
  • Fibres tend to be directed down and forwards although the lowest fibres are almost horizontal
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11
Q

What are thought to be the specific functional roles of VMO?

A
  • Contributes to knee extension due to its insertion into the patella
  • VMO important in stabilising the patella i.e. preventing lateral displacement, and is often the first to weaken with injury
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12
Q

What structures (bony and soft tissue) are most important for maintaining patellar stability?

A
  • Vastus medialis – but also the functional interplay of all surrounding muscles
  • Patellar retinaculum
  • Patella ligament - prevents patella from moving superiorly
  • Limb alignment and joint geometry - patella and trochlear of femur
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13
Q

What is the common origin of the hamstring muscles (except the short head of biceps femoris)?

A

Ischial tuberosity
- Semitendinosus and biceps femoris long head arise from a common tendon, semimembranosus attaches more laterally

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14
Q

What is the origin of the biceps femoris short head?

A

Lateral lip linea aspera (midshaft to bifurcation), lateral intermuscular septum

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15
Q

Describe the characteristics of the semitendinosus:

A
  • Named because of the tendinous inscription which transects its muscle belly
  • Distal tendon of this muscle is long and relatively thin
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16
Q

What is the distal insertion of semitendinosus?

A

Upper part of the medial surface of tibia as part of the pes anserinus

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17
Q

Describe the architecture of the semitendinosus:

A
  • Cross-sectional area: Intermediate
  • Fascicle direction: Long fibres, low pennation angle
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18
Q

Describe the function of the semitendinosus:

A
  • Hip extension, knee flexion - passes posterior to the hip and knee joints
  • Medial rotation of flexed knee – due to its insertion onto tibia and line of pull
  • Large excursion – designed for range rather than force production
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19
Q

Describe the characteristic of the semimembranosus:

A

Characterised by its extensive membranous proximal aponeurosis

20
Q

What are the distal insertions of semimembranosus?

A
  • Posteromedial aspect of medial condyle of tibia
  • Some fibrous expansions to knee joint capsule e.g. oblique popliteal ligament
21
Q

Describe the architecture of the semimembranosus:

A
  • Cross-sectional area: Intermediate
  • Fascicle direction: Long fibres, low pennation angle
22
Q

Describe the functions of the semimembranosus:

A
  • Hip extension, knee flexion – crosses posterior to hip and knee joints
  • Medial rotation of flexed knee - attachment on tibia and line of pull
23
Q

Describe the merge of the long and short head of the biceps femoris:

A

The muscle bellies of these 2 heads merge in the distal, lateral thigh to form a common round tendon of insertion

24
Q

Describe the distal insertions of the biceps femoris:

A
  • Lateral aspect of head of fibula
  • Lateral condyle of tibia
25
Q

Describe the functions of the biceps femoris:

A
  • Hip extension, knee flexion - crosses posterior to the hip and knee joints
  • Lateral rotation of flexed knee - attaches laterally to leg, line of action
26
Q

The innervation of the short head of biceps femoris differs to the other muscles in this group - what is its nerve supply?

A

Common fibular branch of the sciatic nerve

27
Q

In the medial group of the hip and thigh, where do all the muscles arise from?

A

The external surfaces of the pubic rami and ramus of the
ischium

28
Q

What nerve innervates the muscles of the medial compartment of the thigh (note pectineus is an exception)?

A

Obturator nerve (L2-4)

29
Q

What are the attachment sites of the pectineus?

A
  • Pecten of pubis and between the iliopubic eminence laterally and pubic tubercle medially
  • Fibres pass downward, backwards and lateralward to attach into the pectineal line of the femur
30
Q

Describe the architecture of the pectineus:

A

Flat and quadrilateral

31
Q

Describe the function of the pectineus:

A
  • Adducts hip - medial location
  • Flexes the hip - located anterior to hip joint, so assists with this movement
32
Q

What nerve innervates the pectineus?

A

Branch of femoral nerve - in some cases (~9%) may be additionally supplied by the obturator nerve

33
Q

What is the origin and insertion of gracilis?

A
  • Origin: Length of inferior pubic ramus and edge of pubic symphysis
  • Insertion: Upper part of shaft of tibia as part of the pes anserinus
34
Q

What other two muscles share the same distal insertion site as gracilis?

A

Semitendinosus and Sartorius

35
Q

Describe the architecture of the gracilis:

A

Long, thin muscle

36
Q

Describe the functions of the gracilis:

A
  • Adducts thigh at the hip joint - located medial
  • Flex and medial rotation of leg (at knee)
  • Flexes leg at the knee joint
37
Q

The adductor muscles (longus, brevis and magnus) have one origin in common, what is it?

A

Pubic ramus - either superior (AL) or inferior (AB and AM)

38
Q

What is the common action of the adductor muscle group?

A

Adduction of the thigh - due to medial location in relation to hip joint

39
Q

What is the orgin and insertion of the adductor longus?

A

Origin: Superior ramus of pubis (medial portion)
Insertion: Middle 1/3 of the medial lip of linea aspera (between the tendon of vastus medialis and adductor magnus)

40
Q

What is the orgin and insertion of the adductor brevis?

A

Origin: Inferior pubic ramus (between attachments of gracilis and obturator externus)
Insertion:
- Lower 2/3 pectineal line
- Upper 1/2 medial lip of linea aspera

41
Q

What are the attachment sites of the adductor magnus?

A
  • Lower part of inferior pubic ramus, ramus of ischium, ischial tuberosity
  • Medial side gluteal ridge, uppermost part of linea aspera,
  • Whole length of medial lip of linea aspera
  • Supracondylar ridge/line, Adductor tubercle of the medial epicondyle of femur
42
Q

What are the 2 portions of the adductor magnnus?

A
  1. Adductor portion: fibres arise from ischiopubic ramus, are fan-shaped, and have extensive attachments to linea aspera and medial supracondylar ridge
  2. Hamstring portion: fibres are almost vertical in orientation, passing from the ischial tuberosity to the adductor tubercle
43
Q

What nerve innervates the adductor magnus?

A
  • Adductor portion: Obturator nerve
  • Hamstring portion: Tibial nerve
44
Q

What functions are attributed to the different parts of adductor magnus?

A
  • Together function as an adductor of the thigh, may medially/laterally rotate the hip joint depending on the position of the limb
  • Posterior portion thought to contribute to hip extension (with hamstrings)
45
Q

What are the attachment sites of the obturator externus?

A
  • External aspect of superior and inferior pubic rami, ischial ramus, external surface of obturator membrane
  • Tendon passes across the back of the neck of the femur and lower part of hip joint to attach into trochanteric fossa of femur
46
Q

Describe the function of the obturator externus:

A

Lateral rotator of thigh

47
Q

What nerve innervates the obturator externus?

A

Obturator nerve