illogical attitude <Chinese>不自然姿勢（癔癥性癲癇）
illusion <Chinese>錯覺
imbecility <Chinese>癡愚
imipramine <Chinese>丙咪嗪
impinge <Chinese>侵犯
impotence <Chinese>陽萎
incisura <Chinese>切跡
incitogram <Chinese>沖動發放
inclusion body encephalitis <Chinese>包涵體腦炎
incomplete hemianopia <Chinese>不全偏盲
incongruous hemianopia <Chinese>非對稱性同側偏盲
incontinence <Chinese>失禁
incoordination <Chinese>失協調
increased intracranial pressure <Chinese>顱內壓增高
indenolol <Chinese>茚心安
indomethacin <Chinese>吲哚美辛（消炎痛）
indusium griseum <Chinese>灰被
infantile dementia <Chinese>嬰兒癡呆
infantile encephalopathy <Chinese>嬰兒腦病
infantile hemiplegia <Chinese>嬰兒偏癱
infantile myopathy <Chinese>嬰兒肌病
inferior cerebellar peduncle <Chinese>小腦下腳
inferior colliculus <Chinese>下丘
inferior fovea <Chinese>下凹
inferior frontal gyrus <Chinese>額下回
inferior frontal suleus <Chinese>額下溝
inferior horn of lateral ventricle <Chinese>側腦室下角
inferior longitudinal fasciculus <Chinese>下縱束
inferior petrosal sinus <Chinese>巖下竇
inferior quadrigeminal brachium <Chinese>下丘臂
inferior sagittal sinus <Chinese>下矢狀竇
inferior tempotal gyrus <Chinese>顳下回
inferior tempotal suleus <Chinese>顳下溝
infundibular recess <Chinese>漏斗隱窩
infundibulum <Chinese>漏斗
infusion <Chinese>注射
inhibitory area <Chinese>抑制區
inhibitory postsynaptic potential <Chinese>抑制性突觸后電位
initial segment of axon <Chinese>軸突起始段
inoccipitia <Chinese>枕葉缺失
inosine <Chinese>肌苷
inositol nicotinate <Chinese>煙酸肌醇酯
inositol <Chinese>肌醇
insidious <Chinese>隱襲的
instantaneous <Chinese>瞬時
insula <Chinese>島葉
insula， island of Reil <Chinese>腦島
insulin <Chinese>胰島素
intention neuralgia <Chinese>肋間神經痛
intention spasm <Chinese>意向性痙攣
intention tremor <Chinese>意向性震顫
interferon <Chinese>干擾素
interleukin-2 <Chinese>白細胞介素-2
intermediolateral column <Chinese>中間柱
intermesenteric plexus <Chinese>腸系膜間叢
intermittent claudication <Chinese>間歇性跛行
intermittent cramp <Chinese>間歇性痙攣
intermittent <Chinese>間歇
internal band of Baillarger <Chinese>拜勞格氏內帶
internal capsule <Chinese>內囊
internal granular layer <Chinese>內顆粒層（大腦皮質）
internal limiting membrane <Chinese>內界膜
internal medullary lamina <Chinese>內髓板
internal meningitis <Chinese>硬腦膜內層炎
internal pyramidal layer <Chinese>內錐體層（大腦皮質）
internuclear ophthamoplegia <Chinese>核間性眼肌麻痹
interoceptor <Chinese>內感受器
interpeduncal fossa <Chinese>腳間窩
interpeduncular cistern <Chinese>腳間池
intersegmental reflex <Chinese>節段間反射
interventricular foramen <Chinese>室間孔
intracephalic <Chinese>腦內的
intracerebellar <Chinese>小腦內的
intracerebral <Chinese>大腦內的
intracranial pressure <Chinese>顱內壓
intracranial <Chinese>顱內的
intradural <Chinese>硬腦膜內的
intrameningeal <Chinese>腦膜內的
intraneural plexus <Chinese>神經內叢
intraneural <Chinese>神經內的
intraparietal suleus <Chinese>頂內溝
intrasegmental reflex <Chinese>節段內反射
involuntary <Chinese>不隨意
involution syndrome <Chinese>更年期綜合征
ipsilateral <Chinese>同側
iris <Chinese>虹膜
ischaemia <Chinese>缺血
ischemic cerebrovascular disease <Chinese>缺血性腦血管病
ischemic infract <Chinese>缺血性梗塞
ischemic myelomalacia <Chinese>缺血性脊髓軟化
ischemic myopathy <Chinese>缺血性肌病
ischemic neuropathy <Chinese>缺血性神經病
ischialgia <Chinese>坐骨神經痛
isoniazid <Chinese>異煙肼
isoprinosine <Chinese>異丙肌苷
isothermognosis <Chinese>等溫感覺
isothiazine <Chinese>異噻嗪
jackknife seizure <Chinese>折刀狀發作
Jacobson's organ <Chinese>犁鼻器
Jakob-Creutzfeldt disease <Chinese>海綿狀腦病
jaw clenching <Chinese>牙關緊閉
jaw reflex <Chinese>下頜反射
jaw-winking reflex <Chinese>下頜瞬目反射
jerk nystagnmus <Chinese>跳動性眼球震顫
joint receptor <Chinese>關節感受器
Jolly's reaction <Chinese>約利反應
juvenile gangliosidosis <Chinese>少年型神經節苷脂沉積病
Kae's Bekhterev layer <Chinese>克斯——別赫捷列夫層（大腦皮層外粒層內的纖維層）
Kae's feltwork <Chinese>克斯神經纖維網（在大腦皮層內）
Kae's line <Chinese>克斯線（大腦皮層外粒層內的纖維層）
Kafka's test <Chinese>卡夫卡試驗（檢腦脊髓梅毒）
Kalmuk idiocy <Chinese>伸舌性白癡
Kaplan's test <Chinese>卡普蘭試驗（檢腦脊液球蛋白及白蛋白）
Kayser's disease <Chinese>肝豆狀核變性
Kearn-Sayer syndrome <Chinese>凱－塞綜合征
Kehrer's reflex <Chinese>克勒爾反射（聽瞼反射）
Kennedy's syndrome <Chinese>肯尼迪綜合征（腦前葉腫瘤征）
keraunoneurosis <Chinese>閃電性神經病
kernicterus <Chinese>核黃疸
Kernig sign <Chinese>克氏征
Kernohan notch <Chinese>顳葉疝壓跡
kinesthesia <Chinese>運動覺
Klippel-Feil syndrome <Chinese>先天性頸椎缺少或融合
Klumpke paralysis <Chinese>臂叢麻痹的下叢型
Kluver-Bucy syndrome <Chinese>雙側顳葉切除綜合征
knee jerk <Chinese>膝反射
Kolliker's column <Chinese>肌原纖維
Kolliker's interstitial granules <Chinese>肌漿間質粒
Kolliker's membrane <Chinese>蝸管網狀膜
Kolliker's nucleis <Chinese>脊髓中央灰質
koniocortex <Chinese>粒狀皮層
Kopressoff's center <Chinese>排尿中樞
Korsakov syndrome <Chinese>虛構－遺忘綜合征
Korte-Ballance operation <Chinese>科爾特——巴郎斯手術（面神經舌下神經吻合術）
Koshevnikoff's disease <Chinese>持續性不全癲癇
Krabbe leukodystrophy <Chinese>克拉勃腦白質營養不良
Krause's line <Chinese>Z盤
Krishaber's disease <Chinese>腦——心綜合征
Kuf disease <Chinese>青少年型家族性黑蒙性白癡
Kummell disease <Chinese>脊柱壓縮性骨折
Kussmaul's aphasia <Chinese>有意識的失語
Kussmaul's paralysis <Chinese>急性熱病性多神經炎
Kwashiorkor disease <Chinese>嚴重蛋白缺乏綜合征
kyphoscoliosis <Chinese>脊柱后側凸
kyphosis <Chinese>脊柱后凸
labetatal <Chinese>柳芐心胺
labryrinthine nystagmus <Chinese>迷路性眼球震顫
labyrinth <Chinese>迷路
labyrinthine reflex 迷路反射
labyrinthitis <Chinese>迷路炎
lachrymation <Chinese>流涎
lacrimal reflex <Chinese>沁淚反射
lacriml glands <Chinese>淚腺
lactasin <Chinese>乳酶生
actulose <Chinese>乳果糖