| musculus rectus externus | <anatomy, muscle> Origin, lateral part of the common tendinous ring that bridges superior orbital fissure; insertion, lateral part of sclera of eye; action, abduction; nerve supply, abducens. Synonym: musculus rectus lateralis, abducens oculi, musculus rectus externus. (05 Mar 2000) |
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| musculus sphincter ani externus | A fusiform ring of striated muscular fibres surrounding the anus, attached posteriorly to the coccyx and anteriorly to the central tendon of the perineum; it is subdivided, often indistinctly, into a subcutaneous part, a superficial part and a deep part for descriptive purposes. Synonym: musculus sphincter ani externus, external sphincter muscle of anus. (05 Mar 2000) |
| musculus thyroarytenoideus externus | <anatomy> Of or pertaining to both the thyroid and arytenoid cartilages of the larynx. <muscle> Origin, inner surface of thyroid cartilage; insertion, muscular process and outer surface of arytenoid; action, decreases tension on (relaxes) vocal cords lowering the pitch of the voice tone; nerve supply, recurrent laryngeal. Synonym: musculus thyroarytenoideus, musculus thyroarytenoideus externus. (05 Mar 2000) |
| musculus vastus externus | <anatomy, muscle> Origin, lateral lip of linea aspera as far as great trochanter; insertion, tibial tuberosity by way of common tendon of quadriceps femoris and patellar ligament; action, extends leg; nerve supply, femoral. Synonym: musculus vastus lateralis, lateral great muscle, lateral vastus muscle, musculus vastus externus. (05 Mar 2000) |
| nasus externus | The visible portion of the nose which forms a prominent feature of the face; it consists of a root, dorsum and apex from above downward and is perforated inferiorly by two nostrils separated by a septum. Synonym: nasus externus, nasus. (05 Mar 2000) |
| nervus spermaticus externus | <anatomy, nerve> Branch of genitofemoral nerve distributed to skin of anterior scrotum (male) or labia majora (female) and adjacent thigh and supplying a motor branch to the cremaster muscle. Usually passes through deep inguinal ring and canal. Synonym: ramus genitalis nervi genitofemoralis, external spermatic nerve, nervus spermaticus externus. (05 Mar 2000) |
| sulcus spiralis externus | A concavity in the outer wall of the cochlear duct between the prominentia spiralis and the spiral organ. Synonym: sulcus spiralis externus. (05 Mar 2000) |
| obturator externus | <anatomy, muscle> Origin, lower half of margin of obturator foramen and adjacent part of external surface of obturator membrane; insertion, trochanteric fossa of greater trochanter; action, rotates thigh laterally; nerve supply, obturator. Synonym: musculus obturator externus, external obturator muscle. (05 Mar 2000) |
| externus | <anatomy> Situated or occurring on the outside, many anatomical structures formerly called external are now more correctly termed lateral. Origin: L. Externus = outside (18 Nov 1997) |
| acoustic meatus | The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; it consists of a bony (inner) portion and a fibrocartilaginous (outer) portion, the cartilaginous external acoustic meatus. Synonym: meatus acusticus externus, acoustic meatus, antrum auris, auditory canal, external auditory meatus. (05 Mar 2000) |
| atrium meatus medii | The anterior expanded portion of the middle meatus of the nose, just above the vestibule. Synonym: atrium meatus medii, atrium. (05 Mar 2000) |
| bony part of external acoustic meatus | The medial two-thirds of the external acoustic meatus which is formed as the tympanic plate of the temporal bone develops; it extends approximately 16 mm. From its junction with the cartilaginous part to the tympanic membrane. (05 Mar 2000) |
| ramus meatus acustici interni | An alternate term for labyrinthine artery. (05 Mar 2000) |
| cartilage of acoustic meatus | The cartilage that forms the wall of the lateral part of the external acoustic meatus. It is incomplete above and is firmly attached to the margins of the bony part of the external meatus. Synonym: cartilago meatus acustici, meatal cartilage. (05 Mar 2000) |
| cartilaginous part of external acoustic meatus | The lateral third of the external acoustic meatus which is continuous with the auricular cartilage and attached to the circumference of the bony part. (05 Mar 2000) |