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In fractures of middle cranial fossa absence of tears is due to lesions in which nerve and why?
The lacrimal gland produces tears in response to parasympathetic stimulation by the greater petrosal nerve. The greater petrosal is nothing more than a renaming of the parasympathetic fibers contributing to the facial nerve after it exits the internal acoustic meatus. It is this opening in the temporal bone that might be damaged in a cranial base fracture, and might also involve a lesion to the greater petrosal nerve. This would also cause an absense of tear formation. If you want to know more, wikipedia has an excellent discussion of the cranial nerves, and here is a link to the facial nerve page: http://en.wikipedia.org/wiki/Facial_nerve Hope that helps!
What else can I help you with?
What are the 3 lobes in the right side of a lung in a fetal pig?
The right lung of a fetal pig consists of the cranial, middle, and caudal lobes. The cranial lobe is the largest lobe and is further divided into cranial and caudal parts.
He cranial bones have a middle layer of spongy bone called?
diploe
Name the three cranial bones that contain sinuses?
Anterior cranial fossa which accommodates the anterior lobe of brain.Middle cranial fossa, much wider than the anterior cranial fossa contain the 2 temporal lobes of brain.Posterior cranial fossa is much shallower and wider than the middle cranial fossa and it accommodates the occipital lobes of the brain.
Where on each lung are the caudal lobe cranial lobe middle lobe?
Most human beings are born with 1 pair of lungs, a left lung and a right lung. The left lung holds both the cranial and caudal lobes . The right lungs holds the middle, cranial and caudal lobes.
What has the author H C Killey written?
H. C. Killey has written: 'Fractures of the middle third of the facial skeleton' -- subject(s): Facial bones, Fractures, Maxilla
What cranial nerve passes through the middle ear cavity?
I believe it is the facial nerve CN vii
What was the result of absence of effective central authority during the middle ages?
Feudalism.
What hindered the development of towns in the Chesapeake region?
the absence of a vibrant middle class
Where do most fractures of the humerus occur?
Most fractures of the humerus occur in the middle of the bone, around the area of the shaft known as the diaphysis. This is due to the vulnerability of this part of the bone to direct trauma.
How many lungs do wolves have?
A dog has six lung lobes. The right lung has cranial, middle, caudal and accessory lobes, and the left lung has a cranial and caudal lobe. Note. The cranial portion of the left lobe also has a cranial and caudal part, so it looks like the left side has three lobes.
How many lobes are present in the lung of a pig?
A pig's lung has four lobes: cranial, middle, caudal, and accessory lobes. The right lung has all four lobes while the left lung has only the cranial, caudal, and accessory lobes.
In the absence of externalities the middle hand leads a market to maximize?
total benefit to society from that market
