Anatomy Of The Canine Thorax Flashcards
The skeletal boundaries of the thoracic cavity are provided by the
-Thoracic vertebrae (dorsally)
-Ribs and costal cartilages (laterally)
-Sternebrae and costal cartilages (ventrally)
The muscles of the thoracic wall are primarily utilized for respiration:
-serratus dorsalis cranialis and caudalis
-external and internal intercostals
-retractor costae
-scalenus
-Rectus thoracis and Rectus abdominis
-Transversus thoracis (intrathoracic)
The diaphragm serves as the caudal wall of the thoracic cavity and provides a musculo-tendinous separation between the thoracic and abdominopelvic cavities
Parts:
Muscular
-R & L costal parts
-Sternal part
-Lumbar part with left & right crura
Tendinous
-central tendon
-L&R crural tendons
Coverings/Attachments
-pleural covering
-diaphragmatic line of pleural reflection
-mediastinal attachment
-pica venae cavae
Openings in the diaphragm
-lumbocostal arch
-aortic hiatus
-esophageal hiatus
-canal foramen
Serous membranes (tunica serosa)
-line and enclose body cavities, known as serous cavities
-composed of a secretary epithelial layer (mesothelium) and an underlying CT layer
-secretes serous fluid (serum) to reduce friction as organs are moved against one another and the cavity walls
-are named according to their location (parietal or visceral) and the cavity that they define (pleural, pericardial, peritoneal)
Parietal serous membranes
line the walls of a cavity
Visceral serous membranes
cover organs surfaces
Serous cavities within the thoracic cavity
-left pleural cavity
-right pleural cavity
-pericardial cavity - develops within the mediastinum, the space between the two pleural cavities
Where the pleura reflects from one cavity wall to another, recesses (“pockets”) occur:
Processes:
-plural cupula
-costodiaphragmatic recess
-costomediastinal recess
-mediastinal recess
The left cupula
-larger and extends further cranial to the first rib than does the right
-the larger left cupula is created by the cranial part of the cranial lobe of the left lung being slightly to the right of midline
The right pleural cupula
-wide dorsoventrally but extends only approximately half as far cranial as does the left
The apex of the heart is always pointed to the
Left side
The walls of the pericardial cavity are formed by a dense connective tissue sauce called the:
Fibrous pericardium, which is lined internally by parietal pericardium
The mediastinum extends from the
Thoracic inlet to the diaphragm and can be subdivided for descriptive purposes
What is endothoracic fascia?
Epithelial tissue
Connective tissue
Muscle or something else
