又稱舌下神經(jīng)襻,為一纖細的神 經(jīng)環(huán),有時可呈叢狀,位于頸總動脈和頸內靜脈的前外方。來自第1頸神經(jīng)的纖維先加入舌下神經(jīng),再離開之并構成頸襻上根 (或舌下神經(jīng)降支);來自第2、3頸神經(jīng)的纖 維組成頸襻下根(或頸神經(jīng)降支)。兩根...[繼續(xù)閱讀]

    A selflimited condition char acterized by extreme disturbances ofarousal,attention,orientation,perception,intellcetual function,and affect,of ten accompanied by fear and agitation.Clinically,disorientation,sometimes total(including absence of selfrecognit...[繼續(xù)閱讀]

    a branch ofbrachial plexus,arises from the fourth and fifth cervical nerves roots It pierces thescalenus medius,and then runs dorsally as well as caudalward accompanied by the accessory nerve to the anterior border of the levator scapulae and the deep sur...[繼續(xù)閱讀]

    is the term that refers tothat at rest,patients feel seriously unwell in deep part of two legs and that the symptom may be alleviated temporally af ter massage or movement. It may be re lated to local ischemia and anoxia caused by accumulation of some met...[繼續(xù)閱讀]

    在大腦半球內側面,包括扣帶 回、海馬旁回、海馬、齒狀回等結構,圍 繞腦干上端和胼胝體周圍,呈環(huán)狀。...[繼續(xù)閱讀]

    又稱杭廷頓舞蹈 病。是一種遺傳性運動病,為常染色體 顯性遺傳。病理變化為大腦和基底節(jié)廣泛的 變性,尾狀核尤為嚴重,伴有腦萎縮與側腦室 擴大。男女發(fā)病率均等。15～65歲之間都可發(fā) 病,但多見于35～40歲之間。主要臨床表現(xiàn) 為...[繼續(xù)閱讀]

    頭部外傷后,由于硬腦膜、顱 內血管、板障靜脈或硬腦膜靜脈竇破 損,使血液進入顱腔稱為顱內血腫。一般當血 量達到或超過20～30ml時,可出現(xiàn)顱內壓增 高、腦水腫、腦循環(huán)障礙,最后出現(xiàn)頭部損傷 最嚴重的并發(fā)癥之一——腦疝。根...[繼續(xù)閱讀]

    is a thin of gray matter lying between the ex ternal medullary lamina and the internal capsule. Its anterior end extends to the lateral aspect of the anterior nuclei of the thalamus and its ventral part extends to the zona incerta. It is composed chiefly ...[繼續(xù)閱讀]

    This special tests may be carried out to test coordination of the upper extremities. The fingertonose test may be carried out with the patient in thelying,seated,or upright position. The pa tient is asked to abduct and extend completely the arm,and then t...[繼續(xù)閱讀]

    系指生后無需學習和訓練 即有的先天性反射,主要決定于神經(jīng) 系的結構。該類反射對機體適應環(huán)境,維持個 體生存和種系延續(xù)具有重要意義。...[繼續(xù)閱讀]