Glandular Tissue Flashcards
Glandular tissue in the head an neck area includes:
• Lacrimal glands
• Salivary glands
• Thyroid gland
• Parathyroid glands
• Thymus
What is a gland?
a structure that produces a chemical secretion necessary for normal functioning
What are exocrine gland?
a gland that has a duct associated with it
What is a duct?
passageway that allows the secretion to be emptied directly into the location where it needs to be used
What is an endocrine gland?
a ductless gland where the secretion (hormones) are poured into the vascular system, which carries the secretion to the region where it needs to be used
Is the lacrimal gland a paired gland?
Yes
What are lacrimal glands?
Almond-shaped exocrine glands that secrete lacrimal fluid (tears)
The lacrimal gland is divided into what two continuous parts?
• Palpebral part - smaller portion, closest to the eye along the inner portion of the eyelid
• Orbital part - larger, deeper portion
Where is the lacrimal gland located?
Located in the lacrimal fossa of the frontal bone
The nasolacrimal duct (tear duct) begins in the
orbit between the maxilla and lacrimal bone
The canal containing the lacrimal duct is called the
nasolacrimal canal
Cells within the gland secrete lacrimal fluid
Lacrimal gland
Lacrimal fluid travels through ducts to the
surface of the eye, effectively “spreading” tears across the cornea with each blink
Excess tears (lacrimal fluid) drain through small openings in the inner corner of the eye called ________into the tear ducts and eventually empty into the nasal cavity
lacrimal punctum, or puncta
What is the innervation of the lacrimal gland?
Innervated by the greater petrosal nerve (a branch of the facial nerve, or cranial nerve VII)
Lymphatic drainage of the lacrimal gland is into the
superficial parotid lymph nodes
What is the lymphatic system?
a network of vessels and nodes that drains lymphatic fluid from tissues and returns it to circulation
Where does blood supply come from for the lacrimal gland?
lacrimal artery (which is a branch of the ophthalmic artery, which comes from the internal carotid artery)
Venous drainage of the lacrimal gland comes from
the superior ophthalmic vein
Dry eye syndrome is also called
keratoconjunctivitis sicks (KCS)
Dry eye syndrome is a condition where the
Lacrimal glands produce less lacrimal fluid
Dry eye syndrome is caused by
aging or certain medications
Treatment for dry eye syndrome includes
• Avoidance of exacerbating factors
• Tear stimulation
• Tear supplementation
• Increasing tear retention
• Eyelid cleansing
• Treatment of eye inflammation
Salivary glands produce
Saliva