functionalorganizationoftheendocrinesystemcombined messenger activation receptor in plasma membrane...

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Neuron

Nerve impulse

Neurotransmitter

Target cells

Target cells

(b) Endocrine system

(a) Nervous system

Endocrine cells

Hormone in bloodstream

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Blood

Transport protein

Free hormones

Bound hormone

Hydrophobic hormone

Tissue fluid Receptor in nucleus

Second- messenger activation

Receptor in plasma membrane

Target cell

Hydrophilic hormone

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(a) 4 weeks

(b) 8 weeks (c) 16 weeks

Future hypothalamus

Telencephalon of brain

Neurohypophyseal bud

Hypophyseal pouch

Pharynx

Tongue

Mouth

Hypothalamus

Optic chiasm

Posterior lobe

Anterior lobe

Sphenoid bone

Pharynx

Pituitary stalk

Hypothalamus

Pharynx

Hypophyseal pouch

Future thyroid gland

Neurohypophyseal bud

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