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10 Cards in this Set

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RIGHT LYMPHATIC DUCT
4. Right lymphatic duct: formed by the union of the right jugular, right
subclavian, and right bronchomediastinal trunks; immediately after its
formation it empties into the angle of junction of the right subclavian
and right internal jugular veins
THYROID GLAND

LOBES
A. Thyroid gland
1 Lobes: located anterolaterally, between the oblique line of the thyroid
cartilage ofthe larynx and fifth tracheal ring; an isthmus extends across
the second to fourth tracheal rings and unites the lobes
THYROID GLAND

PYRAMIDAL LOBE
A. Thyroid gland

2. Pyramidal lobe: conical process extending superiorly from the isthmus;
present in about 40 percent of individuals
THYROID GLAND

SUPERIOR & INFERIOR THYROID ARTERIES
a. Superior and inferior thyroid arteries: arise from the external carotid
artery and thyrocervical trunk, respectively (see pp. 217 and 219,
respectively)
THYROID GLAND

THYROIDEA IMA
A. Thyroid gland

b Thyroidea ima artery (inconstant): unpaired artery; usually arises
from the brachiocephalic trunk and ascends to the thyroid gland on
the anterior surface ofthe trachea
THYROID GLAND

SUPERIOR THYROID VEIN
A. Thyroid gland

c. Superior thyroid vein: courses with its corresponding artery; drains
into the internal jugular vein
THYROID GLAND

MIDDLE THYROID VEIN
d. Middle thyroid vein: has no corresponding artery; drains into the in-
ternal jugular vein
THYROID GLAND

INFERIOR THYROID VEIN
e. Inferior thyroid vein: drains inferiorly into its respective brachio-
cephalic vein; the two inferior thyroid veins may unite into a single
vein which drains into the left brachiocephalic vein
THYROID GLAND

LYMPHATICS
f. Lymphatics: drain to deep cervical nodes
THYROID GLAND

CLINICAL NOTE
4 Clinical note: tracheostomy surgery is usually performed inferior to the
thyroid isthmus; sources of hemorrhage may include the isthmus ot tlie
thyroid, inferior thyroid veins, jugular venous arch, or the thyroidea ima
artery, if present