Canine Thorax Flashcards
What are ribs 1-9 and where do they attach?
Sternal or “true” ribs and they attach to the sternum
What are ribs 10-13 and where do they attach?
Asternal or “false” ribs and they attach caudal to the sternum
What is the costal arch?
United costal cartilages of ribs 10-12
What is the floating rib?
The 13th rib fails to make contact with the costal arch and instead ends freely in the flank.
What is number 1?
Asternal or “false” ribs
What is number 2?
Floating rib
What is number 3?
Costal arch?
What is number 4?
Sternal or “True” ribs
Thoracic Cavity Boundary - Crainal
Thoracic Inlet
Thoracic Cavity Boundary - Caudal
Diaphragm
Thoracic Cavity Boundary - Dorsal
Thoracic Vertebral Bodies
Thoracic Cavity Boundary - Ventral
Sternum
Thoracic Cavity Boundary - Lateral
Ribs, Costal Cartilages, and Intercostal Muscles,
Thoracic Inlet Boundary - Dorsal
Body of the first Thoracic Vertebra
Thoracic Inlet Boundary - Ventral
First Sternebra (manubrium)
Thoracic Inlet Boundary - Lateral
First pair of Ribs and their costal cartilages.
Thoracic Cavity Contents:
Trachea
Heart
Lungs
Thymus
Esophagus
Lymph Nodes
Vessels
Nerves
Plura Cavity
Pericardial Cavity
Thoracic Inlet Contents:
Trachea
Esophagus
Vagosympathetic Nerve Trunks
Recurrent Laryngeal Nerves
Phrenic Nerves
Ventral branches of 1st and 2nd Thoracic Spinal Nerves
Several Blood Vessels
Pleural Cupulae
What is number 1?
Thoracic Outlet:
Esophageal Hiatus
Esophagus, Dorsal and Ventral Vagal Trunk
What is number 2?
Thoracic Outlet:
Lumbocostal Arch
Sympathetic Trunk and Major Splanchnic Nerve
What is number 3?
Thoracic Outlet:
Cava Foramen
Caudal Vena Cava
What is number 4?
Thoracic Outlet:
Aortic Hiatus
Aortic Vein, Azygous Vein, and Thoracic Duct
What is Endothoracic Fascia?
Connective tissue lising the thoracic cavity and attaching the pleurae to the thoracic wall and diaphragm.
Where is the Endothoracic Fascia?
It passes through the thoracic inlet cranially and blends with the deep cervical fascia.
What is pleura?
Mesothelial membrane which lines the thoracic cavity, encloses the mediastinum, and covers the lungs.
What is mesothelium?
Simple squamous epithelium (derived from mesoderm) which lines the coelomic cavity and its adult derivatives.
What is number 1?
Mesothelium
Ectoderm
What is number 2?
Mesothelium
Mesoderm
What is number 3?
Mesothelium
Endoderm
Where is the Mediastinum located?
Midline partition of the thorax.
What does the Mediastinum include?
Two Mediastinal Pleurae and space between them.
What is enclosed by the Mediastinum?
Thymus
Lymph Nodes
Heart
Aorta
Trachea
Esophagus
Nerves & Vessesl
Varying amounts of connective tissue & Fat
Identify the layer/portion of a tendon sheath which is in direct contact with the tendon.
A. Farietal Layer
B. Visceral Layer
C. Mesotendon
D. Synovial Fluid
B. Visceral Layer
What surround the lungs?
Pleural Cavities
They surround the lungs like a balloon, do not enclose it.
What do the Pleural Cavities contain?
Contains only a small amount of serous fluid in health.
What is number 1?
Costal Parietal Pleura
What is number 2?
Mediastinal Parietal Pleura
What is number 3?
Diaphragmatic Parietal Pleura
What is number 4?
Pulmonary Visceral Pleura
What is the connecting pleura?
ligaments and folds
Pulmonary ligament
Plica Vena Cava
Pneumothorax
The canine mediastinum is easily ruptured, often allowing communication between both pleural cavities.
Identify the Connecting Pleura.
Left: Pulmonary ligament
Right: Plica venae cavae
Where is the Line of Pleural Refection?
Along the horizontal parts of the 8th & 9th costal cartilages, across the 10th & 11th ribs at the costochondral junction, across the middle of the last rib, & cranially to the 12th intercostal space.
What is the fibroserous covering of the heart?
Pericardium
What is the Serous pericardium?
mesothelial sac enclosing the pericardial cavity
(divided into parietal and visceral layers)
What is the fibrous connective tissue covering the parital layer of the serous pericardium?
Fibrous pericardium
What is the Pericardial Sac
Composite structure consisting of 3 layers which surrounds the pericardial cavity.
What is number 1?
Costal Pleura (Parietal)
What is number 2?
Pulmonary Pleura (Visceral)
What is number 3?
Pleural Cavity
What is number 4?
Mediastinal pleura (parietal)
What is number 1?
Mediastinal Pleura
What is number 2?
Pericardial Mediastinal Pleura
What is number 3?
Parietal Serous Pericardium
What is number 4?
Visseral Serous Pericardium
What is number 5?
Pleura Cavity
What is number 6?
Mediastinal Pleura
What is number 7?
Fibrous Pericardium Connective Tissue
What is number 8?
Paricardial Sac (3 layers)
What is cardiac Tamponade?
Excessive fluid accumulation results in compression of the heart.
(Fibrous pericardium preents significant distension of the pericardal cavity in the short term.)
How many lobes does the Left Lung have?
2 Lobes
Cranial lobe (cranial & caudal)
Caudal lobe
How many lobes doe the Right Lung have?
4 Lobes
Cranial
Caudal
Middle
Accessory
Where is the Cardiac Notch?
Right Lung - low in the right 4th - 5th intercostal space.
(can access the heart with a needle w/o hitting the lung)
What is number 1?
Left Cranial Portion of the Cranial Lobe
What is number 2?
Left Caudal Portion of the Cranial Lobe
What is number 3?
Left Caudal Lobe
What is number 4?
Accessory Lobe
What is number 5?
Caudal Lobe
What is number 6?
Middle Lobe
What is number 7?
Cranial Lobe
What is the midline cartilaginous crest where trachea devides into right & left principal bronchi.
Carina
What is the branch from the trachea to the lungs?
Tracheal Bifurcation
What are the Bronchi?
Primary (principal) Bronchus
Secondary (lobar) Bronchus
Tertiary (segmental) Bronchus
What is the Bronchopulmonary segment?
The Tertiary (segmental) Bronchus and the tissue it ventilates.
What artery(ies) function as the nutritional blood supply?
Bronchoesophageal artery
(Located from the right 5th intercostal artery)
What artery(ies) functions as the functional blood supply?
Pulmonary Arteries (from the pulmonary trunk)
What is the purpose of the Functional Blood supply?
Carry nonaerated blood from the right ventricle of the heart to the lungs for gaseous exchange.
Where is the Auscultation Triangle?
Caudal border of the triceps brachii m.
Lateral edge of epaxial mm.
Line paralleling basal border of the lungs
(sternal end of the 6th rib to 11th intercostal space)
Where is the Costodiaphragmatic recess?
The potential space where the diaphragmatic and costal parietal pleura are in contact ith one another.