| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
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| rect | rectal; rectification, rectified; rectum; rectus [muscle] |
| RIR | relative incidence rates; right interior rectus [muscle] |
| RLR | right lateral rectus [muscle] |
| RMR | relative maximum respone; resting metabolic rate; right medial rectus [muscle] |
| lacertus of lateral rectus muscle | <anatomy> The part of the tendon of origin of the lateral rectus muscle attaching to the greater wing of the sphenoid bone, lateral to the common tendinous ring; often incorrectly equated to the lateral check ligament of the eyeball. Synonym: lacertus musculi recti lateralis. (05 Mar 2000) |
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| lateral rectus | <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) |
| lateral rectus muscle of the head | <anatomy, muscle> Origin, transverse process of atlas; insertion, jugular process of occipital bone; action, inclines head to one side; nerve supply, ventral primary ramus of first cervical spinal nerve. Synonym: musculus rectus capitis lateralis, lateral rectus muscle of the head. (05 Mar 2000) |
| annular part of fibrous digital sheath | One of the two circular fibrous bands of the fibrous sheaths of the fingers and toes attached to the shaft of the proximal and middle phalanges. Synonym: pars annularis vaginae fibrosae, annular pulley, annulus of fibrous sheath, ligamentum annulare digitorum. (05 Mar 2000) |
| annulus of fibrous sheath | One of the two circular fibrous bands of the fibrous sheaths of the fingers and toes attached to the shaft of the proximal and middle phalanges. Synonym: pars annularis vaginae fibrosae, annular pulley, annulus of fibrous sheath, ligamentum annulare digitorum. (05 Mar 2000) |
| axillary sheath | Fibrous neurovascular sheath, formed as an extension of the prevertebral layer of deep cervical fascia through the cervicoaxillary canal, which enclosed the first part of the axillary artery, the axillary vein, and the brachial plexus. (05 Mar 2000) |
| carotid sheath | The dense fibrous investment of the carotid artery, internal jugular vein, and vagus nerve on each side of the neck, deep to the sternocleidomastoid muscle; the layers of cervical fascia blend with it. Synonym: vagina carotica. (05 Mar 2000) |
| giant cell tumour of tendon sheath | A nodule, possibly inflammatory in nature, arising commonly from the flexor sheath of the fingers and thumb; composed of fibrous tissue, lipid-and haemosiderin-containing macrophages, and multinucleated giant cells. Synonym: localised nodular tenosynovitis. (05 Mar 2000) |
| parotid sheath | The part of the investing cervical fascia that ensheaths the parotid gland and is fixed above to the zygomatic arch. Synonym: fascia parotidea, fibrous capsule of parotid gland, parotid sheath. (05 Mar 2000) |
| Mauthner's sheath | <cell biology> Plasma membrane of an axon. (12 Mar 1998) |
| caudal sheath | A group of microtubules arranged cylindrically around the caudal pole of the nucleus in a developing spermatozoon. (05 Mar 2000) |
| resectoscope sheath | An operative sheath through which transurethral electroresection of bladder tumours or prostate gland can be performed. (05 Mar 2000) |
| medullary sheath | <anatomy, neurology> An insulating layer surrounding vertebrate peripheral neurons, that dramatically increases the speed of conduction. It is formed by specialised Schwann cells, that can wrap around neurons up to 50 times. The exposed areas are called nodes of Ranvier: they contain very high densities of sodium channels and action potentials jump from one node to the next, without involving the intermediate axon, a process known as saltatory conduction. (18 Nov 1997) |
| root sheath | One of the epidermic layers of the hair follicle: external root sheath is continuous with the stratum basale and stratum spinosum of the epidermis; internal root sheath comprises the cuticle of the internal roots, Huxley's layer, and Henle's layer. (05 Mar 2000) |
| Rouget-Neumann sheath | The amorphous ground substance between an osteocyte and the lacunar or canalicular wall. (05 Mar 2000) |