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The platysma muscle lies just deep to the subcutaneous fascia and fat. [1] [3] It covers many structures found deeper in the neck, such as the external carotid artery, the external jugular vein, [4] the parotid gland, [4] the lesser occipital nerve, [4] the great auricular nerve, [4] and the marginal mandibular branch of the facial nerve.
In many people, it is elicited by bending the head forward. [2] It can also be evoked when a practitioner pounds on the cervical spine while the neck is flexed; this is caused by involvement of the posterior columns. Lhermitte phenomenon is named after the French neurologist Jean Lhermitte. [3]
A 2-D model of cortical sensory homunculus. A cortical homunculus (from Latin homunculus 'little man, miniature human' [1] [2]) is a distorted representation of the human body, based on a neurological "map" of the areas and portions of the human brain dedicated to processing motor functions, and/ or sensory functions, for different parts of the body.
The final cut must be controlled in order to reach only half the neck of the samurai; the kaishaku, leaving the required skin to hold the head attached to the samurai's body, was performed by a single slashing/withdrawing motion of the katana. The complete cut-slash-withdraw motion is called daki-kubi.
The alar ligaments are two strong, rounded cords of about 0.5 cm in diameter that run from the sides of the foramen magnum of the skull to the dens of the axis, the second cervical vertebra. [1] They span almost horizontally, creating an angle between them of at least 140°.
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