Glossary 137 



Met"enceph'alon. [G. meta + enkephalon, brain.] The after-brain. Applied to the 

 cerebellum and pons together. 



Mi'kron (also written mi'cron). [G., small.] One-thousandth of a millimeter. 



Mito'sis, -ses. [G. mitos, a thread.] Primarily the splitting of the chromatin thread 

 in karyokinesis ; then, the whole process. 



Mor'ula, -ulae. [L., a little mulberry.] So-called from the superficial resemblance. 



Mu'cus (mew'kus). [L.] Slime. 



Muco'sum. [L.] Mucous; resembling, or secreting, mucus. 



Myel-. [G. myelos, marrow.] A word-part referring to the spinal cord or myelon 

 ("spinal marrow"), or to marrow. 



My"elenceph'alon. [Myel -(-.G. enkephalos, brain.] The common part of the brain 

 and cord ; the medulla oblongata. 



My'elin. The white or " marrow-like " substance in the medullary sheath. 



Myo-, My-. [G. mys, muscle.] A word-part meaning muscle, or pertaining to mu-cle. 



My'oblast. [Myo -f- blast] The cell which gives rise to (generates) muscle cells. 



Myxede'ma. [G. myxa, mucus; oideme, a swelling.] The name is applied because of 

 the increase in and degeneration of the connective tissue, tending to mucosity. 



Neur-, neuri-, neuro-. [G. neuron, nerve.] Word-parts meaning nerve or neural. 



Neu"rilem'ma. See -lemma. 



Neuro'glia. [Neuro -\- G. glia, glue.] The structure which binds the nerve cells 

 together in the brain and cord. 



Neu"roker'atin. [Neuro- + G. keras, horn.] 



Neur'on. [G., nerve.] The functional unit of nervous tissue. 



Neu'roplasm. [See -plasm.] 



Nervus, -vi. [L.] A nerve. 



Node. [L. nodus, a knot.] Primarily, an enlargement ; then, either a swelling or a 

 constriction. 



Nucle'olus. [L.] Diminutive of nucleus. 



Nu'cleus. [L., a nut, or kernel.] Applied to a smaller body contained in a larger. 



Oblonga'ta. [L. ob'.ongus, oblong.] Applied only to the medulla oblongata. 



Oc'ulo-. [L. oculus, the eye.] Word-part referring to the eye as an organ. 



Olfacto'rius. [L.. fr. olfacere, to smell.] Ol'factory. 



Omen'tum, -ta. [L., the membrane enclosing the viscera.] The mesenteries connect- 

 ing the liver, spleen, and stomach.] 



Ophthal'mic. [G. ophthahnos, the eye.] Pertaining to the eye as a structure. 



Osteo-. [G. osteon, bone.] A word-part meaning bone or bony. 



Os'teoblast. [Osteo -f- blast, q. v.~] 



Ot-, o'to-. [G. ous, the ear.] A word-form referring to the organs of hearing struc- 

 turally, rather than functionally. 



Pacin'ian (pachin'ian). Described by Pacini, an Italian anatomist. 



Pan'creas. [G., fr. pan, all ; kreas, flesh.] So called because its secretion digests 

 both fat and lean. 



Papill'a, ae. [L., a nipple, teat.] A teat-like structure, usually sensitive to touch. 



Pars, par'tes. [L.] A part. 



Par"athy'roid. [G. para, beside, near ; thyroid, q. v.~] 



Pari'etal. [L. paries, a wall.] Applied primarily to the parietal bone, forming part 

 of the top and side of the skull cavity, and then to details in the brain in the 

 region covered by this bone. Also applied to structures in, or on, the wall of 

 any organ. 



