How is an exoskeleton similar to an internal skeleton how is it different

Differences.

Exoskeleton

1. Hard part that lies outside of the body

2. Develops from ectoderm

3. Composed mainly of  hard non-living material called chitin.

Endoskeleton

1. Hard part that lies inside the body

2. Develops from endoderm

3. Composed of living material i.e. bone tissue

 Similarities

Both endoskeleton and exoskeleton play a protective role. The  endoskeleton protects internal body organs of the organism. The exoskeleton  protects the soft  body parts and appendages of the organism.

Both endoskeleton and exoskeleton provide structural support and shape to the  concerned organism.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.