Download App

Control and Co-ordination — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination5 Marks
Question
Explain the structure of spinal cord.
✓

Answer

Structure of spinal cord:
  1. Spinal cord is a 42 to 45 cm long, 2 cm thick and hollow tube, extending from medulla oblongata to lumbar region.
  2. It lies in the neural canal of vertebral column.
  3. At the other end, it tapers down and is called conus medullaris. The posterior most end is called filum terminale which appears as a thread-like structure.
  4. Beyond the second lumbar vertebra, it forms a horse tail-like structure called cauda equina. Cauda equina is a bunch of dorsal and ventral roots of last pair of spinal nerves.
  5. There are two swellings on the spinal cord. The upper is cervical swelling and lower is lumbar swelling. Accordingly there are two plexuses, the cervical plexus supplying nerves to hands and the lumbar plexus supplying nerves to legs.
  6. 31 pairs of spinal nerves arise from spinal cord.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions in detail." from Control and Co-ordination→Control and Co-ordination — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

The biology teacher asked her students to verify the experiment on transformation principle in bacteria to establish DNA as genetic material. The class was divided into two groups. The teacher asked them to submit the reports. Group 2 did not use mouse and did not repeat Griffith's experiment. The teacher praised them.
  1. Which experiment did they perform?
  2. Explain the experiment in brief.
  3. Who and when performed the transformation principle experiment?
  4. What values did students of group 2 exhibit?
→
Ringworm.
→
Describe the functions of the following:
Seminiferous tubules.
→
More than 25% of human population is suffering from hunger and malnutrition. Scientists have developed techniques where microbes are grown on industrial scale as a source of good protein which can be grown from waste water, animal manure and even sewage.
Based on the above information answer the following questions.
  1. In what ways would it be helpful to humans?
  2. What can be the response to such new ventures?
  3. What values have been manifested in the above case?
→
What is EBG? What information can be obtained from the EEG?
→
Loss of biodiversity leads to the overall imbalance in the ecosystem.
→
Angiosperm flowers may be monoecious, cleistogamous or show self-incompatibility. Describe the characteristic features of each one of them and state which one of these flowers promotes inbreeding and outbreeding respectively.
→
Answer the following questions:
Explain the role of ovarian hormones in inducing changes in the uterus during menstrual cycle.
→
List the characteristics of the disorders mentioned above that help in their diagnosis.
→
With the help of labelled diagrams describe the structures of human sperm and unfertilized ovum. A couple unable to conceive. Which modern techniques are available to overcome this problem?
→