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AREOLAE TISSUE, TENDONS, AND MUSCLES. 211
the gland is in relation with the genio-glossus muscle, its lower surface
with the mylo-hyoid, and closely relates with the submaxillary duct
and the lingual branch of the fifth nerve.
The sublingual or ducts of Rivinus vary in number from eight to
twenty, corresponding generally to the lobules contained in the gland
;
they open separately upon the surface of the nuicous membrane over
the ridge formed by the gland, and a few may open into the submax-
illary duct.
The Duct of Bartholin is a single duct of the sublingual gland formed
by the confluence of small ducts arising from the posterior lobules,
which, at times, receive small branches from the submaxillary gland.
It passes in close proximity to the submaxillary duct, and either opens
into it or upon the nuicous membrane near the orifice of the latter
duct.
The blood-vessels of the sublingual gland are from the submaxillary
and sublingual arteries and the veins.
The neyve-svpply is derived from the submaxillary ganglion.
The Lachrymal Gland and its Ducts (Figs. 104, 10-5) leading to the
Nascd Chamber.—The lachrymal gland is situated principally within
Fig. 104.

Xaclivtivial in. 'I' "^

The Meibomian Glands, etc , seeii from the inner surface of tVie eyelids.
the lachrymal fossa of the frontal bone, at the superior lateral angle of
the orbit, behind the external angular process of the frontal bone, Avhich
aifords it protection. It is about half an inch wide by thi'ce-fourths of
an inch long. Its shape is somewhat that of a flattened almond. It is
concavo-convex, and has two surfaces, inferior and superior.
The Inferior or Concave Surface is in relation with the capsule of Tenon
or the fascia of the ball of the eye, and the superior and external recti
muscles.
The Superior or Convex Surface is closely applied to the periosteum
of the frontal bone, to which it is connected by a few tendinous fibres.
The lachrymal gland is racemose in structure, and is identical with
the true salivary glands, such as the parotid in man. It is enclosed in