Unit C: Body Systems

Unit C: Body Systems

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Masters

ANATOMY – study of the parts of the body

PHYSIOLOGY – function of the body

ANATOMICAL POSITION – standing erect with face forward, arms at the side, palms forward

Anatomic Terminology – Position and Direction

·  ANTERIOR or VENTRAL – front or in front of

·  POSTERIOR or DORSAL – back or in back of

·  CRANIAL – refers to the head of the body

·  CAUDAL – means tail end

·  SUPERIOR – upper or above something

·  INFERIOR – lower or below something

·  MEDIAL – toward the middle

·  LATERAL – toward the side of the body

·  PROXIMAL – toward the point of attachment to the body or the trunk of the body

·  DISTAL – away from the point of attachment to the body

·  SUPERFICIAL (EXTERNAL) – near the surface or outside the body

·  DEEP (INTERNAL) – inside the body

Body Planes and Sections

·  PLANES – imaginary anatomical dividing planes

·  SECTION – cut made through the body in the direction of a certain plane

·  SAGITTAL PLANE – divides the body into right and left parts

·  CORONAL (FRONTAL) PLANE – vertical cut at right angles to saggital plane, divides the body into anterior and posterior portions

·  TRANSVERSE PLANE – cross-section, a horizontal cut that divides the body into upper and lower parts

Cavities of the Body

·  DORSAL CAVITY – contains brain and spinal cord – the brain is in the CRANIAL CAVITY and the spinal cord is in the SPINAL CAVITY.

·  ANTERIOR or VENTRAL CAVITY contains the THORACIC and ABDOMINOPELVIC CAVITIES

·  The thoracic cavity contains the lungs and heart

·  ABDOMINAL CAVITY contains stomach, intestines, liver, gallbladder and pancreas

·  PELVIC CAVITY contains urinary bladder and reproductive organs

Abdominopelvic Cavity Regions

Tissues

TISSUES – cells grouped because they are similar in shape, size, structure, and function

·  EPITHELIAL TISSUE – protects the body by covering internal and external surfaces, and produces secretions

·  CONNECTIVE TISSUE – supports and connects organs and tissue

·  MUSCLE TISSUE – has the ability to contract and move the body

·  NERVOUS TISSUE – cells that react to stimuli and conduct an impulse

ADIPOSE TISSUE – type of connective tissue that stores fat cells

LIGAMENTS – strong, flexible bands of connective tissue that hold bones firmly together at the joints

TENDONS – white bands of connective tissue attaching skeletal muscle to bone

CARTILAGE – firm, flexible support of the embryonic skeleton and part of the adult skeleton

MEMBRANES – formed by putting two thin layers of tissue together, cells may secrete a fluid

·  MUCOUS MEMBRANES– lines digestive, respiratory, reproductive and urinary systems – produces mucous to lubricate and protect the lining

·  SEROUS MEMBRANES – double-walled membrane - produces a watery fluid, lines closed body cavities

1. the outer part of the membrane that lines the cavity is the PARIETAL membrane

2. the part that covers the organs is the VISCERAL membrane.

§  PLEURAL MEMBRANE – lines thoracic or chest cavity and protects the lungs

§  PERICARDIAL MEMBRANE – lines the heart cavity and protects the heart

§  PERITONEAL MEMBRANE – lines the abdominal cavity and protects abdominal organs

Organs and Systems

ORGAN SYSTEM – a group of organs which act together to perform a specific, related function

·  Integumentary

·  Skeletal

·  Muscular

·  Digestive

·  Respiratory

·  Circulatory

·  Excretory

·  Nervous

·  Endocrine

·  Reproductive