| quadrate muscle of upper lip | Composed of three heads usually described as three separate muscles; they are the caput angulare or levator labii superioris alaeque nasi muscle; caput infraorbitale or levator labii superioris muscle; caput zygomaticum or zygomaticus minor muscle. Synonym: quadrate muscle of upper lip. (05 Mar 2000) |
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| elevator muscle of upper lip | <anatomy, muscle> Origin, maxilla below infraorbital foramen; insertion, orbicularis oris of upper lip; action, elevates upper lip; nerve supply, facial. Synonym: musculus levator labii superioris, caput infraorbitale quadrati labii superioris, elevator muscle of upper lip. (05 Mar 2000) |
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| elevator muscle of upper lip and wing of nose | <anatomy, muscle> Origin, root of nasal process of maxilla; insertion, wing of nose and orbicularis oris muscle of upper lip; action, elevates upper lip and wing of nose; nerve supply, facial. Synonym: musculus levator labii superioris alaeque nasi, caput angulare quadrati labii superioris, elevator muscle of upper lip and wing of nose. (05 Mar 2000) |
| tubercle of upper lip | The slight projection on the free edge of the centre of the upper lip at the lower extent of the philtrum. Synonym: tuberculum labii superioris, procheilon, prochilon, tubercle of upper lip. (05 Mar 2000) |
| upper lip | The muscular fold forming the superior border of the mouth. Synonym: labium superius oris. (05 Mar 2000) |
| plantar quadrate muscle | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |
| quadrate muscle | <anatomy> A muscle that is more or less square in shape. Synonym: musculus quadratus, quadrate muscle. (05 Mar 2000) |
| quadrate muscle of loins | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |
| quadrate muscle of sole | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |
| quadrate muscle of thigh | <anatomy> Insertion, intertrochanteric ridge; origin, lateral border of tuberosity of ischium; action, rotates thigh laterally; nerve supply, nerve to quadratus femoris (sacral plexus). Synonym: musculus quadratus femoris, quadrate muscle of thigh. (05 Mar 2000) |
| quadrate pronator muscle | <anatomy, muscle> Origin, distal fourth of anterior surface of ulna; insertion, distal fourth of anterior surface of radius; action, pronates forearm; nerve supply, anterior interosseous. Synonym: musculus pronator quadratus, quadrate pronator muscle. (05 Mar 2000) |
| lumbar quadrate muscle | <anatomy, muscle> Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves. Synonym: musculus quadratus lumborum, lumbar quadrate muscle, quadrate muscle of loins. (05 Mar 2000) |
| depressor muscle of lower lip | <anatomy, muscle> Origin, anterior portion of lower border of mandible; insertion, orbicularis oris musculus and skin of lower lip; action, depresses lower lip; nerve supply, facial. Synonym: musculus depressor labii inferioris, depressor muscle of lower lip, musculus quadratus labii inferioris, musculus quadratus menti. (05 Mar 2000) |
| elevator muscle of upper eyelid | <anatomy, muscle> Origin, orbital surface of the lesser wing of the sphenoid, above and anterior to the optic canal; insertion, skin of eyelid, tarsal plate, and orbital walls, by medial and lateral expansions of the aponeurosis of insertion; action, raises the upper eyelid; nerve supply, oculomotor. Synonym: musculus levator palpebrae superioris, elevator muscle of upper eyelid, musculus orbitopalpebralis, palpebralis. (05 Mar 2000) |
| accessory quadrate cartilage | The two to four cartilaginous plates of the wing of the nose posterior to the greater alar cartilage. Synonym: cartilagines alares minores, accessory quadrate cartilage. (05 Mar 2000) |
| quadrate | 1. Having four equal sides, the opposite sides parallel, and four right angles; square. "Figures, some round, some triangle, some quadrate." (Foxe) 2. Produced by multiplying a number by itself; square. " Quadrate and cubical numbers." 3. Square; even; balanced; equal; exact. " A quadrate, solid, wise man." 4. Squared; suited; correspondent. " A generical description quadrate to both. <anatomy>" Quadrate bone, a bone between the base of the lower jaw and the skull in most vertebrates below the mammals. In reptiles and birds it articulates the lower jaw with the skull; in mammals it is represented by the malleus or incus. Origin: L. Quadratus squared, p. P. Of quadrare to make four-cornered, to make square, to square, to fit, suit, from quadrus square, quattuor four. See Quadrant, and cf. Quadrat, Quarry an arrow, Square. 1. <geometry> A plane surface with four equal sides and four right angles; a square; hence, figuratively, anything having the outline of a square. "At which command, the powers militant That stood for heaven, in mighty quadrate joined." (Milton) 2. <astronomy> An aspect of the heavenly bodies in which they are distant from each other 90 deg, or the quarter of a circle; quartile. See the Note under Aspect. 3. <anatomy> The quadrate bone. Origin: L. Quadratum. See Quadrate. Source: Websters Dictionary (01 Mar 1998) |