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The extrinsic auricular muscles are the three muscles surrounding the auricula or outer ear: anterior auricular muscle; superior auricular muscle; posterior auricular muscle; The superior muscle is the largest of the three, followed by the posterior and the anterior. In some mammals these muscles can adjust the direction of the pinna.
The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear.The adult human ear canal extends from the auricle to the eardrum and is about 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.
The outer ear is the external portion of the ear and includes the fleshy visible auricle, the ear canal, and the outer layer of the eardrum (also called the tympanic membrane). [2] [3] The auricle consists of the curving outer rim called the helix, the inner curved rim called the antihelix, and opens into the ear canal.
The antitragicus is an intrinsic muscle of the outer ear. In human anatomy, the antitragicus arises from the outer part of the antitragus, and is inserted into the cauda helicis (or tail of the helix) and antihelix. [1] [2] The function of the muscle is to adjusts the shape of the ear by
The transverse muscle of auricle (transverse auricular muscle, [1] transversus auriculae, transversus auricularis or transverse muscle of pinna [2]) is an intrinsic muscle of the outer ear. The muscle is located on the cranial surface of the pinna .
The helicis minor is an intrinsic muscle of the outer ear. The muscle runs obliques and covers the helical crus , part of the helix located just above the tragus . The helicis minor originates from the base of the helical crus, runs obliques and inserts at the anterior aspect of the helical crus where it curves upward above the tragus.
Facing the inner ear, the medial wall (or labyrinthic wall, labyrinthine wall) is vertical, and has the oval window and round window, the promontory, and the prominence of the facial canal. Facing the outer ear, the lateral wall (or membranous wall), is formed mainly by the tympanic membrane, partly by the ring of bone into which this membrane ...
The tragicus, also called the tragus muscle or Valsalva muscle, [1] is an intrinsic muscle of the outer ear. It is a short, flattened vertical band on the lateral surface of the tragus . [ 1 ]