| musculus dilator iridis | <anatomy> The radial muscular fibres extending from the sphincter pupillae to the ciliary margin; some anatomists regard them as elastic, not muscular, in humans. Synonym: musculus dilator pupillae, dilator iridis, dilator of pupil, musculus dilator iridis. (05 Mar 2000) |
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| musculus dilator naris | See: nasalis muscle. (05 Mar 2000) |
| musculus dilator pupillae | <anatomy> The radial muscular fibres extending from the sphincter pupillae to the ciliary margin; some anatomists regard them as elastic, not muscular, in humans. Synonym: musculus dilator pupillae, dilator iridis, dilator of pupil, musculus dilator iridis. (05 Mar 2000) |
| musculus dilator pylori gastroduodenalis | The longitudinal muscular fibres that open the gastroduodenal junction. Synonym: musculus dilator pylori gastroduodenalis. (05 Mar 2000) |
| musculus dilator pylori ilealis | The longitudinal muscular fibres that open the ileal orifice at the level of the caecocolic junction. Synonym: musculus dilator pylori ilealis. (05 Mar 2000) |
| musculus dilator tubae | That portion of musculus tensor veli palatini that attaches to the mucous membrane of the auditory tube; formerly described as a separate muscle. (05 Mar 2000) |
| musculus ejaculator seminis | <anatomy> In the male: origin, the perineal membrane fascia on the dorsum of the bulb of the penis; insertion, central tendon of the perineum and the median raphe on the free surface of the bulb; action, constricts bulbous urethra when attempting to expel last drops following urination, or spasmodically with ejaculation to expel semen. In the female: origin, the dorsum of the clitoris, the corpus cavernosum, and the perineal membrane; insertion, central tendon of the perineum; action, acts as a weak sphincter of the vagina; when developed, is a part of "cross-member musculature" of pelvic floor which resists prolapse of pelvic viscera. Nerve supply, pudendal (deep perineal branch). Synonym: musculus bulbospongiosus, musculus bulbocavernosus, musculus ejaculator seminis, musculus sphincter vaginae, sphincter vaginae. (05 Mar 2000) |
| musculus epicranius | <anatomy> Composed of the epicranial aponeurosis and the muscles inserting into it, i.e., the occipitofrontalis musculus and temporoparietalis musculus. Synonym: musculus epicranius, epicranial muscle, scalp muscle. (05 Mar 2000) |
| musculus epitrochleoanconeus | An occasional muscle origin, from the back of the medial condyle of the humerus, and insertion into the medial side of the olecranon process. (05 Mar 2000) |
| musculus erector clitoridis | <anatomy, muscle> Origin, ramus of ischium; insertion, corpus cavernosum penis (or clitoridis); action, compresses the crus of the penis (or clitoris) forcing blood in its sinuses into the distal part of the corpus cavernosum; nerve supply, perineal. Synonym: musculus ischiocavernosus, musculus erector clitoridis, musculus erector penis. (05 Mar 2000) |
| musculus erector penis | <anatomy, muscle> Origin, ramus of ischium; insertion, corpus cavernosum penis (or clitoridis); action, compresses the crus of the penis (or clitoris) forcing blood in its sinuses into the distal part of the corpus cavernosum; nerve supply, perineal. Synonym: musculus ischiocavernosus, musculus erector clitoridis, musculus erector penis. (05 Mar 2000) |
| musculus erector spinae | Origin, from sacrum, ilium, and spines of lumbar vertebrae; it divides into three columns, iliocostalis musculus, longissimus musculus, and spinalis musculus, which insert into ribs and vertebrae with additional muscle slips joining the columns at successively higher levels; action, extends vertebral column; nerve supply, dorsal primary rami of spinal nerves. Synonym: musculus erector spinae, erector muscle of spine, musculus sacrospinalis. (05 Mar 2000) |
| musculus extensor brevis digitorum | 1. <anatomy, muscle> (foot) Origin, dorsal surface of calcaneus; insertion, by four tendons fusing with those of the extensor digitorum longus, and by a slip attached independently to the base of the proximal phalanx of the great toe; action, extends toes; nerve supply, deep peroneal. Synonym: musculus extensor digitorum brevis, musculus extensor brevis digitorum, short extensor muscle of toes. 2. (hand) A short extensor muscle of the fingers of rare occurrence, and comparable to the short extensor of the toes. Synonym: musculus extensor digitorum brevis manus, Pozzi's muscle. (05 Mar 2000) |
| musculus extensor brevis pollicis | <anatomy, muscle> Origin, dorsal surface of radius; insertion, base of proximal phalanx of thumb; action, extends and abducts the thumb; nerve supply, radial. Synonym: musculus extensor pollicis brevis, musculus extensor brevis pollicis, short extensor muscle of thumb. (05 Mar 2000) |
| musculus extensor carpi radialis brevis | <anatomy, muscle> Origin, lateral epicondyle of humerus; insertion, base of third metacarpal bone; action, extends and abducts wrist radialward; nerve supply, radial. Synonym: musculus extensor carpi radialis brevis, short radial extensor muscle of wrist. (05 Mar 2000) |