. Cunningham's Text-book of anatomy. Anatomy. Auditory tube Membrana tympani Recessus epitympanicus External acoustic meatus Fig. 703.—Diagrammatic View of the Organ of Hearing. Tuberculum auriculae Cymba conchas Crus helicis Incisura intertragica. Lobule Fig. 704.—View of Lateral Surface of Left Auricula (half natural size). The auricula is usually smaller and more finely modelled in the female than in the male, but presents great varia- tions in size and shape in different indi- viduals. In the newly born child its length is about one-third of that of the adult, while it increases slightly i
. Cunningham's Text-book of anatomy. Anatomy. Auditory tube Membrana tympani Recessus epitympanicus External acoustic meatus Fig. 703.—Diagrammatic View of the Organ of Hearing. Tuberculum auriculae Cymba conchas Crus helicis Incisura intertragica. Lobule Fig. 704.—View of Lateral Surface of Left Auricula (half natural size). The auricula is usually smaller and more finely modelled in the female than in the male, but presents great varia- tions in size and shape in different indi- viduals. In the newly born child its length is about one-third of that of the adult, while it increases slightly in length and breadth in old age. The relation of the width to the height is termed the auricular index, and is expressed as follows :— width of auricula x 100 . , . „ —i rr—t. =—, = Auricular index. length ol auricula This index is less in white than in dark races. The cephalo-auricular angle may be practically absent, as in those cases where the skin of the head passes directly on to the lateral surface of the auricula, or it may be increased to nearly a right angle, so that the lateral surface of the auricula looks directly forwards. The tuberculum auriculae, the significance of which was recognised by Darwin, is a somewhat triangular prominence which projects forwards in cases where the helix is well rolled over, but backwards and upwards when the incurving of the helix has been arrested. More frequently present in men than m women, it is of developmental interest since it has been shown to be well marked at the sixth month of foetal life, the entire auricula, at this stage, resembling in appearance that of the adult macaque monkey. The lobule may be small and sessile or considerably elongated ; it may adhere to the skin of the cheek ( webbed), or may tend to bifurcate at its lower Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illust
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
