Human Anatomy

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Human Anatomy

• The Muscle System III

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G. Abdominal Muscles
Anterior 1 Lateral - 3
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1. Rectus Abdominis (ant.)
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Lateral Abdominal Muscles

• Three layers
• External oblique
• Internal oblique
• Transverse abdominis
• All increase intra-abdominal pressure
• Lifting heavy weight
• Valsalva movement

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2. External oblique
Hands in the pocket
Most superficial of the 3
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3. Internal oblique
Right angle to external oblique
Middle layer
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4. Transverse abdominis
Deepest of the 3 layers horizontal
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H. Hip Muscles (ant. view)
Anterior view
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H. Hip Muscles (post. view)
Posterior view
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1. Psoas major 2. Iliacus
Flexors of hip joint
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3. Gluteus maximus
Extensor of hip joint
Extensor agonist of hip joint
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3. Gluteus maximus
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I. Anterior Thigh
Five muscles
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1. Sartorius
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1. Sartorius
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Quadriceps

• Consist of 4 synergistic muscles
• Share a tendon that attaches to tibial tuberosity
• Contraction results in extension of knee joint

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Quadriceps (4)
All 4 attach to the tibial tuberosity
All 4 extend the knee joint
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2. Rectus femoris
Quadriceps tendon
Extension of knee joint
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3. Vastus lateralis
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4. Vastus medialis
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5. Vastus intermedius
Deep to the rectus femoris
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J. Medial Thigh

• Gracilis
• Adductor
• group

All produce adduction of hip ( knee)
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K. Lateral Thigh (post.)
Tensor fasciae latae
Iliotibial tract IT tract
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L. Posterior Thigh
2 attach medial 1 attaches lateral
3 muscles hamstrings
MEDIAL
LATERAL
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L. Posterior Thigh
All 3 attached to ischial tuberosity
All 3 cause flexion of knee
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1. Semitendinosus
Superficial medial
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2. Semimembranosus
Deep medial
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3. Biceps femoris
Lateral
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M. Posterior Leg
superficial
deep
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1. Gastrocnemius
2 heads
Calcaneous tendon
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2. Soleus
Calcaneous tendon
Shares tendon w/ gastrocnemius
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Anterior Leg

• Tibialis
• anterior

• Extensor
• digitorum

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1. Tibialis Anterior
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1. Tibialis Anterior
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2. Extensor digitorum
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2. Extensor digitorum
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O. Lateral Leg
1. Peroneus longus
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1. Peroneus longus