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Introduction• Latin – mus - mouse• Many resemble a mouse & with their tapering ends
(tendons) representing tail• Contractile tissue - brings about movement • Motors of body• Types
Parts of skeletal muscle• Origin: muscle end; relatively fixed during contraction• Insertion: muscle end; moves during contraction• Attachments: origin & insertion are interchangeable• Belly: Fleshy, Contractile• Fibrous: Non contractile
– Tendon (cord like)– Aponeurosis (flattened sheet)
Deltoid
Origin: Inferior edge of the crest of the spine of the scapula, lateral margin of the acromion, anterior border of lateral one-third of clavicle Insertion: Deltoid tuberosity of humerusNerve supply: Axillary nerve [C5,C6]Action: Abduction of armApplied: IM injection
Gluteal Region
• Gluteus maximus• Gluteus medius• Gluteus minimis• Piriformis• Obturator internus• Gemellus superior• Gemellus inferior• Qadratus femoris• Tensor fasciae latae
Gluteus Maximus• Origin: Fascia covering gluteus
medius, ilium, fascia of erector spinae, sacrum, lateral, coccyx, sacrotuberous ligament
• Insertion: Iliotibial tract & gluteal tuberosity of femur
• Nerve supply: Inferior gluteal nerve (L5,S1,S2)
• Action: Extension, lateral rotation and abduction of hip
• Applied: IM injection
Hamstrings – Muscles of Back of Thigh
• Semitendinosus• Semimembranosus• Biceps femoris• Adductor magnus –
hamstring part
Anterior compartment
• Quadriceps– Vastus lateralis– Vastus intermidius– Vastus medialis– Rectus femoris
• Sartorius
Medial compartment
• Adductor longus• Adductor brevis• Adductor magnus• Gracilis• Pectineus• Obturator externus