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Muscular System - Diagrams
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Head & Neck Muscles
• Frontalis: elevate eyebrows
• Orbicularis Oculi: close eyelid
• Zygomaticus: draw angle of lip upward
• Buccinator: draws cheeks against teeth
• Orbicularis Oris: closes mouth
• Platysma: draws lower lip down & back
• Cranial Aponeurosis: connects frontalis to occipitalis
• Temporalis: elevates mandible
• Occipitalis: draws scalp back
• Masseter: elevates mandible
• Sternocleidomastoid:– Flexes head– Draws head toward
shoulder
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Head & Neck Muscles
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Muscles of Mastication
• Masseter: elevates mandible
• Temporalis: elevates mandible acts as synergist to masseter
• Buccinator – holds food between teeth when chewing
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Key Muscles of Facial Expression
• Smiling Muscles– Orbicularis Oculi– Zygomaticus
• Frowning Muscles– Frontalis– Orbicularis Oris– Platysma
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Anterior Neck/Shoulder Muscles
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Post. Neck/Back Muscles
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Muscles of the Axial Skeleton
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Muscles of the Axial Skeleton
• Intrinsic Muscles– Erector Spinae:
maintain posture of back/extension
• Spinalis• Longissimus• Iliocostalis
– Oblique Muscles: rotation of the vertebrae
• Semispinalis
• Muscles of Quiet Respiration– Diaphragm– External Intercostals– Internal Intercostals—deep
breaths
• Abdominal Muscles– External Obliques– Internal Obliques– Transverse Abdominus– Rectus Abdominus
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Anterior Muscles of Shoulder
• Deltoid– Flexion/Extension– Abduction /Adduction– Internal/External Rotation
• Pectoralis Major– Adduction– Flexion– Extension– Internal Rotation
• Biceps Brachii—Flexion
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Muscles of Scapular Stabilization
• Trapezius:– Retraction – Elevation– Depression– Upward Rotation
• Rhomboid—retraction• Levator Scapular—Elevation• Pectoralis Major—
Protraction• Serratus Anterior—
Protraction
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Muscles of the Forearm
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Muscles of the Forearm
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Post. Shoulder/Back Muscles
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Posterior Muscles of Shoulder
• Teres Major– Adduction– Extension– Internal Rotation
• Latissimus Dorsi– Adduction– Extension– Internal Rotation
• Triceps Brachii– Adduction– Extension
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Rotator Cuff Muscles (SITS)
• Supraspinatus– Abduction
• Infraspinatus– External Rotation
Teres Minor External Rotation
Subscapularis Internal Rotation
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Muscles of Hip:Anterior Muscles
• Medial/Adductor Muscles: (forms the muscle mass at the medial side of each thigh)– Adductor Magnus– Adductor Longus– Adductor Brevis– Gracilis
• Anterior Muscles– Iliopsoas—prime
mover of hip flexion– Pectineus—
• Flexion• Adduction
– Sartorius—• Flexion• Lateral Rotation
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Muscles Of Hip:Anterior Muscles
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Muscles of Hip: Gluteal Muscles
• Gluteus Maximus—Hip extension, esp. when climbing stairs or jumping
• Gluteus Medius— Hip abduction; steady pelvis. Site for injections
• Gluteus Minimus—Hip abduction
• Tensor Fasciae Latae—– Flexion– Abduction
** Gluteus Minimus is under the Gluteus Medius
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Muscles of Anterior Thigh• “Quadriceps” As a group act
as powerful knee extensors– Rectus Femoris—
• Hip flexion• Knee extension
– Vastus Lateralis—knee extension
– Vastus Medialis—knee extension
– Vastus Intermedius—knee extension
– Sartorius—most superficial• Hip & Knee Flexion - weak• Lateral Hip Rotation• “cross-legged position”
**Vastus Intermedius is beneath Rectus Femoris
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Muscles of Posterior Thigh
• “Hamstrings” Butchers use their tendons to hang “hams” for smoking– Responsible for Knee
Flexion & Hip Extension– Semimembranosus– Semitendinosus– Biceps Femoris
• Gastrocnemius– Prime mover for plantar
flexion of the foot
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Muscles of the Lower Leg
• Anterior Compartment– Tibialis Anterior—Dorsiflexion
& inversion– Extensor Digitorum Longus– Fibularis Tertius—dorsiflexion
& eversion• Posterior Compartment
– Gastrocnemius—plantar flexion, knee flexion
– Soleus—plantar flexion• Lateral Compartment
– Fibularis Longus—plantar flexion & eversion
– Fibularis Brevis—plantar flexion & eversion
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Muscles of the Leg
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Muscles of the Leg
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ANTERIOR MUSCLES OF THE BODY
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POSTERIOR MUSCLES OF THE BODY