Definition of Primitive sheath. Meaning of Primitive sheath. Synonyms of Primitive sheath

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Definition of Primitive sheath

Primitive sheath
Primitive Prim"i*tive, a. [L. primitivus, fr. primus the first: cf. F. primitif. See Prime, a.] 1. Of or pertaining to the beginning or origin, or to early times; original; primordial; primeval; first; as, primitive innocence; the primitive church. ``Our primitive great sire.' --Milton. 2. Of or pertaining to a former time; old-fashioned; characterized by simplicity; as, a primitive style of dress. 3. Original; primary; radical; not derived; as, primitive verb in grammar. Primitive axes of co["o]rdinate (Geom.), that system of axes to which the points of a magnitude are first referred, with reference to a second set or system, to which they are afterward referred. Primitive chord (Mus.), that chord, the lowest note of which is of the same literal denomination as the fundamental base of the harmony; -- opposed to derivative. --Moore (Encyc. of Music). Primitive circle (Spherical Projection), the circle cut from the sphere to be projected, by the primitive plane. Primitive colors (Paint.), primary colors. See under Color. Primitive Fathers (Eccl.), the acknowledged Christian writers who flourished before the Council of Nice, A. D. 325. --Shipley. Primitive groove (Anat.), a depression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it. Primitive plane (Spherical Projection), the plane upon which the projections are made, generally coinciding with some principal circle of the sphere, as the equator or a meridian. Primitive rocks (Geol.), primary rocks. See under Primary. Primitive sheath. (Anat.) See Neurilemma. Primitive streak or trace (Anat.), an opaque and thickened band where the mesoblast first appears in the vertebrate blastoderm. Syn: First; original; radical; pristine; ancient; primeval; antiquated; old-fashioned.

Meaning of Primitive sheath from wikipedia

- portion of a nerve fiber between two Nodes of Ranvier. The neurolemma or primitive sheath is not interrupted at the nodes, but p****es over them as a continuous...
- is a family of microbats, many of which are referred to as sac-winged or sheath-tailed bats. They are widely distributed in tropical and subtropical regions...
- filaments, while the thin peripheral layer of the collar became the deciduous sheath, forming a tuft of unbranched barbs with a basal calamus. Stage III consists...
- runs with the common carotid artery and vagus nerve inside the carotid sheath. It provides venous drainage for the contents of the skull. The external...
- blood vessels. The contents of the whole plate system are surrounded by a sheath. The three plates are the hilar plate, the cystic plate and the umbilical...
- cells filled with glycoproteins, covered by two helical collagen-elastin sheaths. It lies longitudinally along the rostral-caudal (head to tail) axis of...
- Adamantinoma Other: Liposarcoma Leiomyosarcoma Malignant peripheral nerve sheath tumor Rhabdomyosarcoma Synovial sarcoma Malignant solitary fibrous tumor...
- the endoneurium, which is also called the endoneurial tube, channel or sheath. This is a thin, delicate, protective layer of connective tissue. Perineurium...
- preserves a keratinous sheath, an expected feature but one rarely fossilized. The measured curvature of the keratinous sheath is approximately 120°, longer...
- fungoides) Angiosarcoma Fibrosarcoma Liposarcoma Malignant peripheral nerve sheath tumor Synovial sarcoma Blastoma Adenocarcinoma of the lung Basaloid squamous...