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
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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