Text Questions Flashcards
How many pairs of cranial nerves?
12
How many pairs of spinal nerves?
31
What is the forebrain called? What is it composed of?
Prosencephalon
- Cerebrum
- Diencephalon
What is the midbrain called?
Mesencephalon
What is the hindbrain called? What is it composed of?
Rhombencephalon
-Medulla oblongata
Pons
Cerebellum
What is tectum?
Visual and auditory processing
What is the reflex to visual stimuli in the midbrain via?
The superior colliculus
What is the reflex to auditory stimuli in the midbrain via?
The inferior colliculus
What is tegmentum?
Subconscious control of upper limb position and muscle tone
What is the pons?
The bridge linking the cerebellum with the mesencephalon, diencephalon, cerebrum and spinal cord
What nuclei of cranial nerves are on the pons?
V, VI, VII and VIII
What cell does myelination in the PNS?
Schwann cells
Are unmyelinated axons still encased by Schwann cells?
Yes, but only a single cell membrane layer
What is a dermatome?
The area of skin innervated by a single spinal nerve
How do dermatomes spiral down the limb during foetal development?
The dramatic medial rotation of the lower limbs during the 6th to 8th week causes the mature dermatomes to spiral down the limb.
What is the space located between the sternum, spine, lungs and diaphragm?
The mediastinum
How many layers of pericardium?
Three
Two main types of pericardium?
Fibrous and serous
Two types of serous pericardium?
Parietal layer - outer Visceral layer (epicardium)
What is the fluid between the two layers of the pericardium called?
The pericardial cavity
Three layers of the heart? Which one is the contractile layer?
Epicardium
Myocardium - contractile
Endocardium (deep)
What is the endocardium of the heart comprised of?
Sheet of simple squamous epithelium on a thin layer of connective tissue (lines chambers and valves)
What are cardiac cells interconnected at? What type of junctions are they?
Junctions called intercalated discs
- Gap junctions
- Desmosomes
What are atria of the heart separated by?
The inter-atrial septa
What are ventricles of the heart separated by?
The inter-ventricular septa
What type of tissue is the septa’s’ of the heart?
Fibrous
What are the valves of the heart attached to?
Chordae Tendineae
Three main vessels the right atrium receives from?
Super vena cava, inferior vena cava and the coronary sinus
What is the enclosed hole between the two artias?
Fossa ovalis
What are pectinate muscles?
The pectinate muscles (musculi pectinati) are parallel ridges in the walls of the atria of the heart. They are so-called because of their resemblance to the teeth of a comb as in pecten.
What layer of heart tissue is fat depot in?
Epicardium
Which groove is the coronary sinus, great and small cardiac veins in?
The coronary (atrioventricular) groove
What groove is the middle cardiac vein in?
The posterior inter-ventricular groove
What part of the heart does the great cardiac vein drain?
Primarily the left atrial and ventricle
What part of the heart does the small cardiac vein drain?
The right atrium and ventricle
What part of the heart does the middle cardiac vein drain?
The inter-ventricular septum
What occurs when chaotic atrial contractions are at faster rates than the ventricles?
Atrial fibrillation
What is atrial fibrillation caused by?
Extra electrical impulses disrupting SA node activity
First organ to fully develop in the embryo?
The heart
Three layers of blood vessel walls?
Tunica intima
Tunica media
Tunica externa
What is tunica intima?
Inner simple squamous epithelium forming smooth surface of lumen
What is tunica media?
Middle, circularly arranged smooth muscle cells. Responsible for changing vessel diameter. Thickest layer.
What is tunica externa?
Outer protective connective tissue layer, strengthens and anchors
Order of arteries blood flow?
Blood travels from elastic arteries to muscular arteries to arterioles
What are elastic artery characteristics?
Large
Low resistances
High in elastin (tunica media)
What are muscular artery characteristics?
Distal
Supplies organs
Tunica media is thicker relative to lumen
smooth muscle sandwiched between 2 elastin layers
Muscular layer regulates blood flow to organ
What are arteriole characteristics?
Small
Thin tunica media
Contraction/relaxation regulated via local signals or sympathetic nervous system
Three types of capillaries?
Continuous
Fenestrated
Sinusoid
What are continuous capillaries?
Most common
Least permeable
What are fenestrated capillaries?
Have pores for high exchange rate
What are sinusoid capillaries?
Very leaky for high exchange of large molecules
What percentage of blood do all veins carry?
65%
Difference between muscle layers of veins vs arteries?
Larger lumen
Thicker tunica externa than media
Less elastin
Thinner walls
Two main branches off the ascending aorta?
Right and left coronary artery
What do branches of the thoracic aorta serve?
Pericardium
Lungs/bronchi
Oesophagus
NOT the heart!
What are the anterior thoracic and upper abdominal wall supplied by?
Branches of the subclavian arteries:
The internal thoracic arteries
What three unpaired arteries supply the GI tract and spleen?
Celiac artery
Super and inferior mesenteric artery
Three paired arteries of the abdominal wall?
Supra-renal arteries
Renal arteries
Gonadal arteries
What does the superior vena cava receive blood from?
Everything superior to the diaphragm except for the lungs and heart), and drains into the right atrium
What does the inferior vena cava receive blood from?
Everything inferior to the diaphragm
What vessel receives blood from the heart?
The coronary sinus
Three main veins of the head and neck?
Internal jugular
External jugular
Vertebral veins
What does the internal jugular receive blood from?
The dural venous sinuses (and most of brain)
What does the external jugular receive blood from?
From the posterior and lateral scalp, along with some of the face
What do the vertebral veins receive blood from?
The cervical vertebrae and spinal cord, along with superior neck muscles
What major six veins does the abdominal portion of the inferior vena cava collect blood from?
Lumbar veins Gonadal veins Renal veins Supra-renal veins Hepatic veins Phrenic veins
What two blood supplies does the liver receive?
The hepatic portal vein contains oxygen poor, but nutrient rich blood
The hepatic artery proper contains oxygen rich blood
What types of organs does the hepatic portal vein drain from?
Only unpaired organs
Difference between hepatic vein and hepatic portal vein?
The hepatic vein carries blood out of the liver, but the portal vein carries blood to the liver
What part of the body does the inferior mesenteric vein drain? Where does it receive blood from? (3 veins)
Drains the distal part of the large intestine.
Receives blood from:
- Superior rectal vein
- Sigmoid veins
- Left colic vein
What part of the body does the splenic vein drain? Where does it receive blood from? (3 veins)
Drains the spleen
Receives blood from:
- Pancreatic veins
- Short gastric veins
- Right gastroepiploic vein
What part of the body does the superior mesenteric vein drain? Where does it receive blood from? (5 veins)
Drains the small intestine and part of the large intestine.
Receives blood from:
- Intestinal veins
- Pancreaticoduodenal veins
- Ileocolic veins
- Right colic veins
- Middle colic veins
What do the common iliac veins merge into?
The inferior vena cava
What does the great saphenous vein drain into?
The femoral vein
What does the small saphenous vein drain into?
the popliteal vein
Lymphoid organs?
Red bone marrow Thymus Spleen Lymph nodes Tonsils
What does the red bone marrow do for the lymph system?
Produce lymphocytes
What does the thymus do for the lymph system?
Maturation of T-lymphocytes
What does the spleen do for the lymph system?
Monitor blood
What do the lymph nodes do for the lymph system?
Monitor lymph and destroy pathogens
What do the tonsils do for the lymph system?
Destroy pathogens
Primary lymphoid organs?
Red bone marrow and thymus
Secondary lymphoid organs?
Lymph nodes, spleen and tonsils
What are the functional divisions of the respiratory system?
The conducting and the respiratory zone
What are the anatomical divisions of the respiratory system?
The upper and lower respiratory tract
Difference between external and nasal cavities?
External is the nasal bone and hyaline cartilage, the internal is the nasal cavity
What is the roof of the nasal cavity formed by?
The ethmoid and sphenoid bones
What sinuses filter the air in the nasal cavity?
Paranasal sinuses
Two type of mucosa membranes in the nasal cavity?
Olfactory and respiratory mucosa
What is respiratory mucosa?
Epithelium with goblet cells, function to trap inhaled debris and moisten air
What does conchae do to inhaled air?
Filter, heat and moisten air (by cooling conchae)
What does conchae do to exhaled air?
Cool conchae take out moisture and extract heat back from air
What is the groove inferior to each concha called?
A meatus
Three conchae spaces?
Superior, middle and inferior
Three sections of pharynx?
Nasopharynx
Oropharynx
Laryngopharynx
What closes the entrance to the nasopharynx?
The uvula
What type of tissue is found in the nasopharynx?
Pseudo-stratified ciliated columnar epithelium
What type of tissue is found in the oropharynx?
Squamous epithelium
What type of tissue is found in the laryngopharynx?
Squamous epithelium
What does the larynx do?
Connect the laryngopharynx to the trachea
Where is the laryngeal vestibule?
Above the vocal cords
Where is the laryngeal ventricle?
Between the vestibular and vocal cords
What is the opening between vocal folds called?
Rima glottis
What are the nine cartilages of the larynx?
Thyroid Cricoid Arytenoid x 2 Corniculate x 2 Cuneiform x 2 Epiglottis
What region of the spine does the trachea divide? What is this region?
The Carina - at T4-T7
What muscle decreases the trachea diameter?
Trachealis muscle
What is responsible for the cough reflex?
The Carina
What ligaments connect the cartilage rings of the thorax?
Annular ligaments