. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE OKGAN OF HEARING. 53 commonly seen between the tragus and root of the helix, or between the antihelix and helix. The outgrowth of the ear may be arrested at any stage. The mandibular part is supplied, as one would expect from its origin, by the third division of the 5th, while the sensory fibres of the hyoid part come from the 2nd cervical by the great auricular and small occipital nerves. Darwin's Tubercle.âThe human ear appears to be derived from a form in which the margin was pointed at the posterior superi
. Human embryology and morphology. Embryology, Human; Morphology. DEVELOPMENT OF THE OKGAN OF HEARING. 53 commonly seen between the tragus and root of the helix, or between the antihelix and helix. The outgrowth of the ear may be arrested at any stage. The mandibular part is supplied, as one would expect from its origin, by the third division of the 5th, while the sensory fibres of the hyoid part come from the 2nd cervical by the great auricular and small occipital nerves. Darwin's Tubercle.âThe human ear appears to be derived from a form in which the margin was pointed at the posterior superior angle, such as is seen in many of the lower forms of apes and mammals generally. With the retrogression of the posterior border or descending helix and increased development of the antihelix in the human ear, the posterior margin became infolded; hence the tip appears as a tubercle on the inturned posterior margin or welt of the human ear (Fig. 38). Muscles of the External Ear.âThese are derived from the. saccus endolymph, semicircular canal periotic capsule otocyst (utricle) pharynx tympanum vein â facial nerue antrum â chorda tympani malleus drum ext. and. meatus tragus Fio 39 -Showing the condition of the Auditory Organs in a 6th week human foetus. (After Siobenmann.) platysma sheet and are supplied by the nerve of that sheetâ the Vllth or facial. The ear muscles are not so reduced in man as in some other primates, such as the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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