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1 . The Human Body: An Orientation: Part B. Anatomical Position. Standard anatomical body position: Body erect Feet slightly apart Palms facing forward. Upper limb. Cephalic. Acromial. Frontal. Brachial (arm). Orbital. Antecubital. Nasal. Antebrachial (forearm). Oral. Mental.

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  1. 1 The Human Body: An Orientation: Part B

  2. Anatomical Position • Standard anatomical body position: • Body erect • Feet slightly apart • Palms facing forward

  3. Upper limb Cephalic Acromial Frontal Brachial (arm) Orbital Antecubital Nasal Antebrachial (forearm) Oral Mental Carpal (wrist) Cervical Manus (hand) Thoracic Palmar Axillary Pollex Mammary Digital Sternal Abdominal Lower limb Umbilical Coxal (hip) Pelvic Femoral (thigh) Inguinal (groin) Patellar Crural (leg) Fibular or peroneal Pubic (genital) Pedal (foot) Tarsal (ankle) Thorax Metatarsal Abdomen Digital Back (Dorsum) Hallux (a) Anterior/Ventral Figure 1.7a

  4. Table 1.1

  5. Table 1.1

  6. Table 1.1

  7. Table 1.1

  8. Table 1.1

  9. Regional Terms • Two major divisions of body: • Axial • Head, neck, and trunk • Appendicular • Limbs • Regional terms designate specific areas

  10. Axial and Appendicular

  11. Upper limb Cephalic Acromial Frontal Brachial (arm) Orbital Antecubital Nasal Antebrachial (forearm) Oral Mental Carpal (wrist) Cervical Manus (hand) Thoracic Palmar Axillary Pollex Mammary Digital Sternal Abdominal Lower limb Umbilical Coxal (hip) Pelvic Femoral (thigh) Inguinal (groin) Patellar Crural (leg) Fibular or peroneal Pubic (genital) Pedal (foot) Tarsal (ankle) Thorax Metatarsal Abdomen Digital Back (Dorsum) Hallux (a) Anterior/Ventral Figure 1.7a

  12. Upper limb Cephalic Otic Acromial Occipital (back of head) Brachial (arm) Olecranal Cervical Antebrachial (forearm) Back (dorsal) Manus (hand) Scapular Metacarpal Vertebral Digital Lumbar Lower limb Sacral Femoral (thigh) Gluteal Popliteal Perineal (between anus and external genitalia) Sural (calf) Fibular or peroneal Pedal (foot) Thorax Abdomen Back (Dorsum) Calcaneal Plantar (b) Posterior/Dorsal Figure 1.7b

  13. Body Planes • Plane: Flat surface along which body or structure is cut for anatomical study

  14. Body Planes • Sagittal plane • Divides body vertically into right and left parts • Produces a sagittal section • Midsagittal (median) plane • Lies on midline • Parasagittal plane • Not on midline

  15. Body Planes • Frontal (coronal) plane • Divides body vertically into anterior and posterior parts • Transverse (horizontal) plane • Divides body horizontally into superior and inferior parts • Produces a cross section • Oblique section • Cuts made diagonally

  16. Frontal plane Median (midsagittal) plane Transverse plane (a) Frontal section (through torso) (b) Transverse section (through torso, inferior view) (c) Median section (midsagittal) Pancreas Aorta Spleen Liver Spinal cord Intestines Rectum Spleen Left and right lungs Liver Heart Body wall Vertebral column Stomach Arm Subcutaneous fat layer Figure 1.8

  17. Anatomical Variability • Over 90% of all anatomical structures match textbook descriptions, but: • Nerves or blood vessels may be somewhat out of place • Small muscles may be missing

  18. Body Cavities • Dorsal cavity • Protects nervous system • Two subdivisions: • Cranial cavity • Encases brain • Vertebral cavity • Encases spinal cord

  19. Body Cavities • Ventral cavity • Houses internal organs (viscera) • Two subdivisions (separated by diaphragm): • Thoracic cavity • Abdominopelvic cavity

  20. Cranial cavity Dorsal body cavity Ventral body cavity Cranial cavity (contains brain) Vertebral cavity Superior mediastinum Dorsal body cavity Thoracic cavity (contains heart and lungs) Pleural cavity Pericardial cavity within the mediastinum Vertebral cavity (contains spinal cord) Ventral body cavity (thoracic and abdominopelvic cavities) Diaphragm Abdominal cavity (contains digestive viscera) Abdomino- pelvic cavity Pelvic cavity (contains urinary bladder, reproductive organs, and rectum) (a) Lateral view (b) Anterior view Figure 1.9a-b

  21. Ventral Body Cavities • Thoracic cavity subdivisions: • Two pleural cavities • Each houses a lung • Mediastinum • Contains pericardial cavity • Surrounds thoracic organs • Pericardial cavity • Encloses heart

  22. Ventral Body Cavities • Abdominopelvic cavity subdivisions: • Abdominal cavity • Contains stomach, intestines, spleen, and liver • Pelvic cavity • Contains urinary bladder, reproductive organs, and rectum

  23. Cranial cavity Dorsal body cavity Ventral body cavity Cranial cavity (contains brain) Vertebral cavity Superior mediastinum Dorsal body cavity Thoracic cavity (contains heart and lungs) Pleural cavity Pericardial cavity within the mediastinum Vertebral cavity (contains spinal cord) Ventral body cavity (thoracic and abdominopelvic cavities) Diaphragm Abdominal cavity (contains digestive viscera) Abdomino- pelvic cavity Pelvic cavity (contains urinary bladder, reproductive organs, and rectum) (a) Lateral view (b) Anterior view Figure 1.9a-b

  24. Basic Body Plan

  25. Basic Body Plan

  26. Serous Membrane (Serosa) • Thin, double-layered membrane separated by serous fluid • Parietal serosa lines internal body walls • Visceral serosa covers the internal organs

  27. Parietal peritoneum Parietal pleura Visceral pleura Visceral peritoneum Parietal pericardium Visceral pericardium (c) Serous membranes line body cavitiesclosed to the exterior. Figure 4.11c

  28. Outer balloon wall (comparable to parietal serosa) Air (comparable to serous cavity) Inner balloon wall (comparable to visceral serosa) Heart Parietal pericardium Pericardial space with serous fluid Visceral pericardium (b) The serosae associated with the heart. Figure 1.10a-b

  29. Abdominopelvic Quadrants • Divisions used primarily by medical personnel

  30. Right upper quadrant (RUQ) Left upper quadrant (LUQ) Right lower quadrant (RLQ) Left lower quadrant (LLQ) Figure 1.11

  31. Abdominopelvic Regions • Nine divisions used primarily by anatomists

  32. Diaphragm Liver Right hypochondriac region Left hypochondriac region Epigastric region Stomach Gallbladder Transverse colon of large intestine Ascending colon of large intestine Right lumbar region Left lumbar region Umbilical region Descending colon of large intestine Small intestine Cecum Initial part of sigmoid colon Right iliac (inguinal) region Hypogastric (pubic) region Left iliac (inguinal) region Appendix Urinary bladder (a) Nine regions delineated by four planes (b) Anterior view of the nine regions showing the superficial organs Figure 1.12

  33. Other Body Cavities • Oral and digestive cavities • Nasal cavity • Orbital cavities • Middle ear cavities • Synovial cavities

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