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Figure
Changes occurring during the fifth (a-c), sixth (d), and seventh (e-g) weeks of development. The photo corresponds to 49 days of development.
Lens
Maxillary process
Hindlimb

Mandibular process
Paddle-shaped forelimb
Mandibular process
Paddle-shaped forelimb
Developing eye
Forebrain

Developing ear
Elbow
Handplate
Developing eye
Forebrain
Nasal pit Tail
Developing ear
Elbow
Handplate
Midbrain
Pigmented eye
Midbrain
Pigmented eye

Paddle-shaped foot plate
Heart prominence
Paddle-shaped foot plate
External auditory meatus
External ear
Wrist
Digital rays
Notches between digital rays
Toe rays
Notches between digital rays
Toe rays

- External ear
- External ear
Ear Eyelid
Ear Eyelid

Webbed fingers
Notches between toe rays
Webbed fingers
Notches between toe rays
Fingers separated
Fan-shaped webbed toes
Fingers separated
Fan-shaped webbed toes

Toes separated

- Lacuna3! filled with maternal blood

Placental membrane
Chorionic villi
Connective tissue
Maternal blood Section of villus
Placental membrane
Chorionic villi
Connective tissue

Essentials of Human Physiology
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.
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