Sternocleidomastoid Muscle

Sternocleidomastoid Muscle

Attachments, relation, nerve supply & action of sternocleidomastoid (or) Sternocleidomastoid (or) Sternocleidomastoid muscle, nerve supply & action
Answer:

Sternocleidomastoid Origin:

• The tendinous sterna head arises from the superolateral part of the front of the manubrium sterni
• The musculotendinous clavicular head arises from the medial one-third of the superior surface of the clavicle

Sternocleidomastoid Insertion:

• By thick tendon into the lateral surface of mastoid process
• By thin aponeurosis into the lateral half of the superior nuchal line of occipital bone

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Sternocleidomastoid Relations:

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Sternocleidomastoid Nerve Supply:

• The spinal accessory nervemotor supply
• Branches from ventral rami of C2proprioceptive

Sternocleidomastoid Actions:

1. Unilaterally the muscle
   • Turns the chin on opposite side
   • Tilt the head towards shoulder on opposite side
2. Bilaterally muscles
   • Draw the head forward for eating
   • Lift the head from pillow
3. With longus colli
   • Flex neck against resistance
   • It helps in forced inspiration

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