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Skeletal System > Muscles > Flashcards

Muscles Flashcards

1
Q

Iliopsoas

A

Composed of iliacus and psoas muscle

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2
Q

Psoas Major

A

Origin: transverse process & bodies of lumbar vertebrae
Insertion: less trochanter femur
Action: hip flexion, lateral rotation, flex trunk on hip (sitting position)

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3
Q

Iliacus

A

Origin: iliac fossa
Insertion: lesser trochanter femur
Action: hip flexion, lateral rotation, flex trunk on hip (sitting position)

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4
Q

Adductors

A

Origin: pubic bone
Insertion: medial/proximal femur
Action: hip addiction & medial rotation

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5
Q

Sartorius

A

O: anterior superior iliac spine
I: medial and proximal surface tibia
A: flexes knee, flexes/abducts & laterally rotates thigh at hip joint (crossing of legs)

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6
Q

Quadriceps

A

Vastus lateralis
Vastus medialis
Vastus intermedius
Recuts femoris

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7
Q

Vastus lateralis

A

O: greater trochanter & proximal lateral femur
I: tibial tuberosity through patellar ligament
A: knee extension

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8
Q

Vastus medialis

A

O: proximal & medial femur
I: tibial tuberosity through patellar ligament
A: knee extension

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9
Q

Vastus intermedius

A

O: anterior & lateral surface of femur
I: tibial tuberosity through patellar ligament
A: knee extension

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10
Q

Rectus femoris

A

O: anterior inferior iliac spine of ilium
I: tibial tuberosity through patellar ligament
A: knee extension & hip flexion
Crosses two joints

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11
Q

Tibialis anterior

A

O: lateral condyle & proximal tibia
I: first metatarsal & first cuneiform
A: dorsifelxion ankle & inversion foot

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12
Q

Extension digitorum longus

A

O: lateral condyle of tibia & anterior surface tibia
I: middle & distal phalanges 2-5
A: ankle dorsiflexion, extends toes

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13
Q

Fibularis (peroneus) longus

A

O: head & body of fibula & lateral condyle of tibia
I: first metatarsal & 1st cuneiform
A: ankle plantarfelxion & foot eversion

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14
Q

Gluteus Maximus

A

O: iliac crest, sacrum, coccyx
I: iliotibial tract of tensor fascia lata & gluteal tuberosity
A: hip extension & lateral rotation

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15
Q

Gluteus medius

A

O: ilium
I: greater trochanter of femur
A: hip abduction, medial rotation

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16
Q

Hamstrings-biceps femoris

A

O:
LONG HEAD: ischial tuberosity
SHORT HEAD: proximal femur
I: head of fibula & lateral condyle tibia
A: flexes knee and hip extension
*two heads of origin & crosses two joints

17
Q

Hamstrings semimembranosis

A

O: ischial tuberosity
I: medial condyle of tibia
A: flexes knee and hip extension
*crosses two joints

18
Q

Hamstrings semitendinosis

A

O: ischial tuberosity
I: proximal & medial tibia
A: Flexes knee and hip extension
*crosses two joints

19
Q

Gastrocnemius

A

O: lateral & medial condyle femur
I: calcaneus through achilles tendon
A: plantarflexion & knee flexion
*crosses two joints

20
Q

Soleus

A

O: head of fibula & medial tibia
I: calcaneus through achilles tendon
A: plantarflexion

21
Q

Skeletal muscle

A

Most skeletal muscles fibres are attached by tendons to bones
Large, cigar shaped and multinucleate
Aka striated muscle because of its stripes
Aka voluntary muscle because it’s the only muscle tissue subject to conscious control

22
Q

Connective tissues

A

Endomysium
Perimysium
Episyium

23
Q

Endomysium

A

Encloses a single muscle fibre

24
Q

Perimysium

A

Wraps around a facicle (bundle) of muscle fibres

25
Q

Epimysium

A

Covers the entire skeletal muscle
-fascia= on the outside of the epismysium

26
Q

Connective tissue attachment

A

Tendons
Aponeuroses

27
Q

Tendons

A

Cordlike structures
Mostly collagen fibers
Often cross a joint bc of their toughness & small size

28
Q

Aponeuroses

A

Sheetlike structures
Attach muscles indirectly to bones, cartilages, or connective tissue coverings

29
Q

Muscle functions

A

Maintain posture & body position
Stabilize joints
Generate heat

30
Q

Microscopic anatomy of skeletal muscles

A

Sacrolemma
Myofibrils

31
Q

Sacrolemma

A

Specialized plasma membrane
Layer under Endomysium

32
Q

Myofibrils

A

Long organelles inside muscle cell
Light (i) and dark (a) bands that give the muscle it’s striated appearance

33
Q

Sacromere

A

Contractile unit of a muscle fibre
Structural and functional unit of skeletal muscles

Skeletal System (4 decks)

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