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Origin, insertion, and action of platysma what is the spinalis group known all together as? Origin...

Origin, insertion, and action of platysma

what is the spinalis group known all together as?

Origin and insertion for the extensor retinaculum

Origin and insertion of inguinal ligament

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Answer #1

1) Platysma

Origin: it originates originates from subcutaneous tissue of infraclavicular and supraclavicular regions

Insertion: base of mandible, skin of cheek and lower lip, angle of mouth, orbicularis Oris.

Action: responsible for sad and frightened expression. Meaning that it draws the corner of the mouth inferiorly and widens it.when teeth are clenched, it draws the skin of neck superiorly.

Spinalis group consist of 3 muscles- spinalis dorsi, spinalis cervicis, spinal capitis

2) Extensor retinaculum

Origin: triwuetrum and pisiformis

Inseryion- lateral margin of radius

3) inguin ligament

Origin- anterior superior iliac crest of ileum

Insertion- pubic tubercle of pubic bone

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