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Moscre Tole to rorehas stake of contradt® ia vesting Ms. — Due to Y efferent discharge - Req: to maintain posture: - Altered in physio. conditions (steep, annietyl 4 disease processea Funan. ume, Cerebellar Aesinar) - Iisa fen of muscle Spindle of sk ms. # Sensovy veveptors of Musue- + Musde Spindle + sense mu: Leng % vate of 4 of tengtn- + G70: Sease tendon tension “4 vate Of Sof tension + Proprio ceptors: info. about position Y mmt- of various body parts: " Sl- Lowest devel fer control of stm activity — undey contre of higher centers: 2 Musa spindle — Speialined sense organs- in a sk ms- in Mammals M)s-_spindle» 1 Spindle shaped L .. 2: fibers of ans: cpi only sensory ti +t pingdle recep toy c motor Supply + Lach Ms: 4a_endlosed_in.a CT capsude- 5 te 10mm in Lt- ~tonkain atva funat fibers: 7 Central part -non-voatracile, Sensitive to shebe - 4Upplied by Afferent > Peri. part - tontrachile - Aupphied by ¥ efferents - no! contviburion |p force generation - Types of intrafusat fiber: 'V. Aluckar bag fibers: Sense beth Gin teagin 4 vake of 4 ia feng tr: Ta QY. Nudeary chain fibers: sense Oi Length In, I 2E| Activation ot | ma: spilnde: + Stretua of central part: i. Aengthening of whole muaree- 2Y. Contraction ot intra fusat fiben. # Tanevyation_of Ms- Have bot. seasony (ALE) % mote (EH) AH: Tn 4T fiver. u larger oliam., Faster Vion” Pendings: annulospival endings. tnt in born Auden bag | % drain Vendings: Hower spray endings. Only mEin_nuuear chain. 4 7 4 4 Stvetning of ms > strettning of Ms: —» Ta SI —¥+ se [synapse on ann — SE Herenr front a-MN tretas Rellen : only) m ic |wetten. J Stve fy) monosynaprie tt eee eee Operates ak Level of sc under conc of nigher centres: Brain stem ’ cfrebbellium Contrattion of ms- Basee tanguha (Response) Cereb vam. Ae Cone of ¥- MN @ Yo MN > bulboretiquar farilietny area- hyperactive Sten veHen- Tron ssion, of Stretn Info: Tension MS y &TO — 0800s Devsat column pakvanas, ———> Higher centres Stre tay % Sping - cevewetan brauy #* Myotactic Retien NT: Glutamare UMN Lesion: enaggerared LMN Lesion: Lose- X- motor neuron affected by ——> Supraspinal patie, Anniety Tendvassitk's Manoeuvre + distrae , the ¥ discharge &- ¢ coauivarion esen dling pata, ar Contra” | intra { tntvafusat fibers at Same time - ~ Keeps spindle tak wnen ma. in _conrracced- > Sustnined onrrastion Canti- gravity as) | * 4roigi Tendon Organ Axn_opp. to ms spindle —> Causes yelanation of rm. Kocation: “Tendon supplied by Ib aff. fiber - terminace indirectty on a nN via interneuron, inhivi eng, ~ Arrangement iS ih Series ms- (ese) @ . . ~ Shvn9q wntraut ——> 410 —¥ Relanarion 410): Teasion feedback oF ms (tension) Cinnivitory MS! Leagm feedbae. interneuvoas) —ey: Abrupt cessation of ms. tontraun Tnyerse Sera. Reflen | fenginening ven Move stvetua —> More —> wntraut? —> Tse tension ——*? when tention enceeds beyond a timit Contraction ceases % Yd anation of m due to &T0- — laure of clasp knife spasticity - inikiqh Resistrrce due bo Stretun Retten huyperacnve ry, Sudden collapse clue to ao veften Hemipleqia Lone of me rps is move affected | Flenon pf- ur % Entenson of LJ Hyper tonia. Parkinson's ds. Cooth gvps entensors 4 Hens ave equaity affeaed] UMN lesion: TTY moter discharge > Hypertonia , Enaggerated deep reftenes [inhibition dost) EMN_ lesion: LAR: Disurnin oteted! Strut % fan a) Ms- Ada a nore on Angmar SAG. Siren reHen ening | vara G10 vettem 
