DIGASTRICUS
\dɪɡˈastɹɪkəs], \dɪɡˈastɹɪkəs], \d_ɪ_ɡ_ˈa_s_t_ɹ_ɪ_k_ə_s]\
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from 'twice,' and 'a belly:' Biventer, B. Maxilloe, Deprimens Maxilloe Biventer, Bigaster, (F.) Mastoidohyogenien, Mastoido-genien- (Ch.), Digastrique, Abaisseur de la machoire inferieure. The name Digastricus was formerly given to several muscles. It is now restricted to one of the muscles of the superior hyoid region. The digastricua is thick and fleshy at its extremities, thin and tendinous at its middle. It is attached to the mastoid groove of the temporal bone, and to a fossette at the side of the symphysis menti. Its tendon passes through an aponeurotic ring, which is attached to the os hyoides. The use of the digastricus is to depress the lower jaw, or to raise the os hyoides, and to carry it forwards or backwards, as in deglutition. The strong double-bellied muscle, which forms the gizzard of birds, is also called Digastricus.
By Robley Dunglison
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(Anterior belly.) Origin: Intermediate tendon. Insertion: Inner surface of lower border of mandible near symphysis. Nerve: Mylo-hyoid. Action: Raises hyoid bone and base of tongue and carries them forward; when hyoid bone is fixed depresses mandible.
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(Posterior belly) Origin: Digastric groove of temporal bone. Insertion: Intermediate tendon which is attached to body of hyoid bone. Nerve: Facial. Action: Raises hyoid bone and base of tongue and carries them backward.
By Alexander Duane
Word of the day
Platidiam
- An inorganic water-soluble platinum complex. After undergoing hydrolysis, it reacts DNA produce both intra interstrand crosslinks. These crosslinks appear to impair replication and transcription of DNA. The cytotoxicity cisplatin correlates with cellular arrest in G2 phase cell cycle.