The basilar membrane is relatively permeable to perilymph in the scala tympani, and tunnel of the organ of Corti and the bases of the hair cells are bathed in perilymph

TLS Online TPP Program

#Id: 1513

#Unit 2. Cellular Organization

Microtubules exist in three forms:

Singlet

Doublet

Triplet

TLS Online TPP Program

#Id: 1514

#Unit 2. Cellular Organization

Most microtubules in a cell consist of a simple tube, a singlet microtubule, built from 13 protofilaments. 

TLS Online TPP Program

#Id: 1515

#Unit 2. Cellular Organization

Doublet contains one complete 13-protofilament microtubule (A tubule) and one additional tubules (B tubule) consisting of 10 protofilaments.

 

TLS Online TPP Program

#Id: 1516

#Unit 2. Cellular Organization

Triplet contains one complete 13-protofilament microtubule (A tubule) and two additional tubules (B & C tubule) consisting of 10 protofilaments each.

TLS Online TPP Program

#Id: 1517

#Unit 2. Cellular Organization

All microtubules are nucleated from structures known as microtubule-organizing centers, or MTOCs.

 

TLS Online TPP Program

#Id: 1518

#Unit 2. Cellular Organization

In MTOCs, 

The (−) end of the microtubule stays anchored in the MTOC while the (+) end extends away from it.