ANAT 1625 Midterm Lecture Notes

ANAT 1625 Midterm Lecture Notes - Visceral Gross OVERVIEW...

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Visceral Gross OVERVIEW OF THORAX: Thorax is btw the neck and abdomen. The floor of the thoracic cavity (thoracic diaphragm) is deeply invaginated inferiorly by viscera of the abdominal cavity. The thorax includes the primary organs of the respiratory and cardiovascular systems. The thoracic cavity is divided into 3 major spaces: the Mediastinum that houses the thoracic viscera except for the lungs and, on each side, the right and left pulmonary cavities housing the lungs. THORACIC WALL: Includes: thoracic cage & muscles that extend btw the ribs & skin, subcutaneous tissue, muscles, and fascia covering its anteriolateral aspect. Mammary glands lie within the subcutaneous tissue of the thoracic wall. Thoracic cage functions to: o Protect vital organs from external forces o Resist negative internal pressures generated by the elastic recoil of the lungs and inspiratory movements. o Provide attachment for and support the weight of the uppers limbs. o Provide origin of many of the muscles that move and maintain the position of the upper limbs relative to the trunk, as well as provide the attachments for muscles of the abdomen, neck, back, and respiration. Within the thorax: Prim. Respiratory and cardiovascular o Heart, great vessels, lungs, and trachea Thoracic cavity divided into 3 parts: 1. Mediastinum (heart and structures transporting air, blood and food; and 2. the right and left pulmonary cavities, occupied by the lungs. RIBS, COSTAL CARTILAGES, AND INTERCOSTALS SPACES: Ribs are flat bones, hematopoietic 1. True (vertebrocostal) ribs: 1-7 2. False ribs: 8-10 3. Floating ribs: 11,12 o Typical ribs: 3-9 Neck: Tubercle: at the junction of neck and body. It’s a part that articulates with the TP of vertebra. Body: thin, flat, curved most at costal angle. The angle demarcates the lateral limit of attachment of the deep back muscles to the ribs. o Atypical ribs: 1 st , 2 nd , and 10-12 th 1 st rib is the broadest, shortest, and most sharply curved of the 7 true ribs. Has single facet on its head for T1. It also has 2 grooves superiorly for the subclavian vessels which are separated by a scalene tubercle. 2 nd rib is thinner, less curved, a lot longer than rib 1. Its head has 2 facets for T1 and T2. Main atypical feature is a rough area on its upper surface, the tuberosity for serratus anterior, from which part of that muscle originates. 10 th -12 th 11 th and 12 th are short and have no neck or tubercle.
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Intercostal spaces: Named for the rib forming the superior border. The 4 th intercostal space lies btw ribs 4&5. There are 11 intercostal spaces and nerves. Intercostal spaces are occupied by intercostals muscles and membranes, and 2 sets of intercostals BV &
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This note was uploaded on 11/22/2011 for the course ANAT 1625 taught by Professor Lescane during the Winter '11 term at Life Chiropractic College West.

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ANAT 1625 Midterm Lecture Notes - Visceral Gross OVERVIEW...

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