Nervous System:
* Brain: Controls all bodily functions, including thought, emotion, and movement.
* Spinal Cord: Transmits signals between the brain and the rest of the body.
* Peripheral Nerves: Carry signals from the brain and spinal cord to muscles, glands, and sensory organs.
* Sensory Organs: Including the eyes, ears, nose, and tongue.
Skin and its Derivatives:
* Epidermis: The outermost layer of skin, providing protection from the environment.
* Hair: Provides insulation and protection.
* Nails: Protect the fingertips and toes.
* Sweat Glands: Regulate body temperature.
* Sebaceous Glands: Produce oil to lubricate the skin and hair.
Other Structures:
* Pituitary Gland: Secretes hormones that regulate growth, metabolism, and other bodily functions.
* Mammary Glands: Produce milk for nursing.
* Enamel of Teeth: The hard outer layer of teeth.
* Lens of the Eye: Focuses light onto the retina.
* Inner Ear: Responsible for hearing and balance.
* Mouth Lining: The inner lining of the mouth.
* Anal Canal: The terminal portion of the digestive tract.
It's important to note that some structures may have contributions from multiple germ layers. For example, the pituitary gland originates from both ectoderm and endoderm.
This is a simplified overview, and the development of these structures is a complex and intricate process.
