lab activity 11: group iii
DESCRIPTION
Lab Activity 11: Group III. Muscles Martini Chapter 11. Portland Community College BI 231. MUSCLES OF DEEP BACK AND GLUTEAL REGION. Gluteus Maximus. Origin: Upper portion of ilium, the sacrum and coccyx Insertion: Gluteal tuberosity and iliotibial tract - PowerPoint PPT PresentationTRANSCRIPT
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Lab Activity 11: Group III
Muscles
Martini Chapter 11
Portland Community CollegeBI 231
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MUSCLES OF DEEP BACK AND GLUTEAL REGION
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• Origin: Upper portion of ilium, the sacrum and coccyx
• Insertion: Gluteal tuberosity and iliotibial tract
• Action: Principal extensor and lateral rotator of femur
Gluteus Maximus
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• Origin: Middle portion of ilium Insertion: Oblique ridge on greater trochanter of femur
• Action: Abducts femur, stabilizes contralateral hip while standing on one leg
Gluteus Medius
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• Origin: Pelvic surface of sacrum
• Insertion: Greater trochanter of femur
• Action: Rotates femur laterally
Piriformis
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• Origin: Ischial tuberosity • Insertion: Greater
trochanter and shaft of femur
• Action: Rotates thigh laterally
Quadratus Femoris
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• Origin: Transverse processes of bodies of lumbar vertebrae
• Insertion: Lesser trochanter of femur with iliacus
• Action: Flexes trunk and flexes and laterally rotates thigh
Psoas Major
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• Origin: Iliac fossa and lateral margin of sacrum
• Insertion: Lesser trochanter of femur with psoas major
• Action: Flexes and laterally rotates femur
Iliacus
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POSTERIOR COMPARTMENT OF THE THIGH (HAMSTRINGS)
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• Origin: Long head, ischial tuberosity;Short head, lateral supracondylar ridge of femur
• Insertion: Head of fibula and lateral condyle of tibia
• Action: Extends femur and flexes leg
Biceps Femoris
Long Head
Short Head
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• Origin: Ischial tuberosity • Insertion: Medial condyle
of tibia • Action: Extends femur
and flexes leg
Semitendinosus
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• Origin: Ischial tuberosity • Insertion: Medial
condyle of tibia • Action: Extends femur
and flexes leg
Semimembranosus
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ANTERIOR COMPARTMENT OF THE THIGH
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• Origin: Anterior superior iliac spine
• Insertion: Medial margin of tibial tuberosity
• Action: Flexes both femur and tibia
Sartorius
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• Origin: Anterior inferior iliac spine and upper margin of acetabulum
• Insertion: Tibial tuberosity
• Action: Extends tibia and flexes femur
Rectus Femoris
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• Origin: Intertrochanteric line and linea aspera of femur
• Insertion: Tibial tuberosity
• Action: Extends tibia
Vastus Lateralis
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• Origin: Intertrochanteric line and linea aspera of femur
• Insertion: Tibial tuberosity
• Action: Extends tibia
Vastus Medialis
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• Origin: Upper shaft of femur
• Insertion: Tibial tuberosity
• Action: Extends tibia
Vastus Intermedius
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POSTERIOR COMPARTMENT OF THE THIGH
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• Origin: Inferior pubic ramus
• Insertion: Upper part of linea aspera
• Action: Adducts, flexes, and medially rotates femur
Adductor Brevis
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• Origin: Between pubic rami near symphysis
• Insertion: Middle third of linea aspera
• Action: Adducts, flexes & medially rotates femur
Adductor Longus
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• Origin: Pubic arch and ischial tuberosity
• Insertion: Linea aspera and adductor tubercle
• Action: Adducts, flexes, and laterally and medially rotates femur
Adductor Magnus
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• Origin: Inferior pubis near symphysis
• Insertion: Upper portion of tibia
• Action: Adducts, flexes, medially rotates tibia
Gracilis
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ANTERIOR AND MEDIAL THIGH
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Tensor Fasciae Latae
• Origin: Iliac crest • Insertion: Iliotibial tract • Action: Flexes thigh,
stabilizes knee
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• Origin: Superior ramus of pubis
• Insertion: Just inferior to the lesser trochanter
• Action: Adducts and flexes thigh, assists with medial rotation of thigh
Pectineus
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SUPERFICIAL POSTERIOR COMPARTMENT
OF THE LEG
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• Origin: Medial and lateral condyles of femur
• Insertion: With soleus into calcaneus via calcaneal tendon
• Action: Flexes tibia and plantar; flexes foot
Gastrocnemius
Superficial
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• Origin: Upper third of fibula and soleal line of tibia
• Insertion: With gastrocnemius into calcaneus via calcaneal tendon
• Action: Flexes foot
Soleus
Second Layer
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• Origin: Lateral supracondylar ridge of femur
• Insertion: Posterior calcaneus via calcaneal tendon
• Action: Weakly assists gastroc in plantar flexing ankle and flexing knee
Plantaris
Second Layer
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DEEP POSTERIOR COMPARTMENT
OF THE LEG
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• Origin: Lateral surface of lateral condyle
• Insertion: Posterior surface of tibia just below condyles
• Action: Flexes and unlocks knee joint
Popliteus
Second Layer
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• Origin: Interosseous membrane and tibia and fibula on either side
• Insertion: Navicular, with slips to cuneiform; cuboid; metatarsals 2-4
• Action: Adducts and inverts foot and aids in plantar flexion
Tibialis Posterior
ThirdLayer
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• Origin: Middle half of tibia • Insertion: By four tendons
into distal phalanges of lateral four toes
• Action: Flexes lateral four toes
Flexor Digitorum Longus
ThirdLayer
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• Origin: Distal two-thirds of fibula
• Insertion: Distal phalanx of great toe
• Action: Flexes great toe
Flexor Hallucis Longus
ThirdLayer
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ANTERIOR COMPARTMENT OF THE LEG
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• Origin: Upper half of tibia and interosseous membrane
• Insertion: Base of first cuneiform and first metatarsal
• Action: Dorsiflexes and inverts foot
Tibialis Anterior
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• Origin: Middle half of fibula and interosseous membrane
• Insertion: Distal phalanx of great toe
• Action: Dorsiflexes foot and extends great toe
Extensor Hallucis Longus
Tendon
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• Origin: Tibia, proximal three-fourths of fibula, & interosseous membrane
• Insertion: Tendons to middle & terminal phalanges of four lateral toes by extensor expansion
• Action: Dorsiflexes foot and extends toes
Extensor Digitorum Longus Tendon
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LATERAL COMPARTMENT OF THE LEG
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• Origin: Upper two-thirds of fibula and intermuscular septa
• Insertion: Plantar base of first metatarsal and first cuneiform and
• Action: Plantar flexes and everts foot
Fibularis Longus
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• Origin: Lower two-thirds of fibula
• Insertion: Plantar base of fifth metatarsal
• Action: Plantar flexes and everts foot
Fibularis Brevis
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DORSUM OF FOOT
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• Origin: Dorsal surface of calcaneus
• Insertion: By four tendons into extensor expansion
• Action: Extends toes
Extensor Digitorum Brevis
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• Origin: Medial surface of calcaneus
• Insertion: Proximal phalanx of great toe
• Action: Extends toes
Extensor Hallucis Brevis
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The End