ZOO 3713C Lecture Notes - Lecture 5: Fontanelle, Human Body, Suprahyoid Muscles
Document Summary
Muscles and regional anatomy of the head and neck and the back. **fontanels in the skull are the unossified remnants of the membranes in newborns. Major fontanels are: anterior (ossified within 18-36 months), posterior, mastoid and sphenoid, which are ossified within 6 month or more. These are mimetic muscle: radiate into the skin of the face and the head, and their contraction causes displacement of the skin. Has 2 bellies: frontal, occipital, and in between, the galea aponeurotica. Epicranius function: produces wrinkles in forehead and gives facial expression of astonishment. Innervation: all mimetic muscles by facial nerve (cranial nerve cnvii) . Muscles in the region of eyelid or palpebral fissure: Function: produces folds in lateral angle of the eye, expression of worry and concern. Pulls the skin and eyebrow down and medially. Mimetic muscles in the region of the mouth. Origin: mandible at 1st or 2nd molar region.
