Laka

The laka ne daya daga cikin ƙungiyoyin da CNS (tsakiya m tsarin), a haɗa jiki zuwa waje yanayi da kuma sarrafa ta ayyuka. Shi ne da godiya ga tsakiya m tsarin, da kuma daban-daban da kuma gabobin tsarin da ake amince a mayar da martani ga canje-canje da faruwa a cikin yanayi.

kwakwalwa sadarwar da jikinsu da kuma wata gabar jiki ta hanyar amfani da laka. Shi aikin da introducer da reflex ayyuka.

Ta yaya ne da kuma inda laka

A tsarin da CNS sashen ne in mun gwada sauki. The laka da aka kafa ta m da fari al'amarin. White al'amarin - wani hadadden tsarin na jijiya zaruruwa (myelinated da unmyelinated), jijiya da jini wanda marginally kewaye da connective nama. Gray Matter samar da jijiya cell jikuna tare da matakai da cewa ba su da myelin daina kai hare hare. Bisa ga cibiyar na laka wuce a tashar wanda aka cika da cerebrospinal ruwa. Tare da kayan ciki kuma wata gabar jiki ta Associated mahara jijiyoyi, wanda aka halin da ta dace fitarwa na mitar.

laka ya kai wani nisa na fara tasawa daya da rabi santimita a tsawon -. 45 cm Its talakawan nauyi ne '35

Shi ne kashin baya igiyar mutum a ciki sarari na kashin baya canal. Outwardly, shi kama wani dogon igiyar da yawa rassan. A babba karshen gare shi ne ba kaifi iyakar dangantawa da da medulla oblongata a na mahaifa vertebra, kasa da aka located a matakin na-II na lumbar vertebrae. Ya ke shiga cikin karshen (kashin baya) thread. Upper karshen rabo daga cikin thread ne da wani ɓaɓɓake daga na tsarin jijiya nama, amma in ba haka ba yana da wani dangane samuwar. Iya shiga zuwa Dura a sacral canal, kashin baya thread a haɗe a ƙarshensa.

Akwai uku membranes kewaye da laka. Inner daina kai hare hare - taushi (jijiyoyin bugun gini) Average - arachnoid da kuma m - m. Daga envelopes zuwa kashi canal ne jijiyoyin cewa ci gaba da laka a tsaye. A sarari dake tsakanin ciki da kuma tsakiyar kwasfa cika cerebrospinal ruwa.

Saboda haka, rami na kashin baya canal inda laka aka located, mai cike da m nama, cerebrospinal ruwa, kwakwalwa membranes da jini.

Tsaye GROOVES raba laka a kan dama da hagu tsakaitã halves.

A kashin baya canal a takaice nesa ne jijiya asalinsu. Sun zo daga kowane rabin, forming biyu a tsaye layuka. Sun bar vertebral canal ta hanyar ramuka foraminarnye. The laka halin da pronounced segmental. Segments koma zuwa bangaren kwakwalwa, wanda barin kashin baya canal jijiyoyi emanating daga gare su. Kowane sashi innervates wani yanki na jikin mutum.

Akwai biyar sassa na laka. Neck kashi kafa guda takwas segments haƙarƙari - goma sha biyu segments, lumbar - biyar sacral - kuma biyar coccygeal - 1-3 kashi. Segments na mahaifa innervate da makamai da kuma wuyansa, thoracic sassa - da kirji da ciki, lumbar da sacral - kafafu, pelvic gabobin da perineum. Jijiya tushen mikawa kasa da matakin na laka endings innervate ƙananan rabin na jiki ciki har da pelvic gabobin.

Cuta na ƙwarai, ko mota aiki na wani yanki na jiki iya nuna rabo daga laka, wanda zai iya haifar da lalacewa.

A gefe jijiyoyi daga laka da jijiyar samu gabobin jiki. Sun tsara da aiki dukkan gabobin. Azanci shine jijiya zaruruwa aika bayanai daga kyallen takarda da kuma gabobin da laka da kuma CNS.