| head-tilt | An abnormal position of the head adopted to prevent double vision resulting from underaction of the vertical ocular muscles. (05 Mar 2000) |
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| head tremors | Head movements associated with congenital nystagmus, spasmus nutans, and miner's nystagmus. Synonym: head tremors. (05 Mar 2000) |
| saddle head | Craniosynostosis in which the upper surface of the skull is concave, presenting a saddle-shaped appearance in profile. Synonym: saddle head. Origin: clino-+ G. Kephale, head (05 Mar 2000) |
| semispinal muscle of head | <anatomy, muscle> Origin, transverse processes of five or six upper thoracic and articular processes of four lower cervical vertebrae; insertion, occipital bone between superior and inferior nuchal lines; action, rotates head and draws it backward; nerve supply, dorsal primary rami of cervical spinal nerves. Synonym: musculus semispinalis capitis, musculus complexus, semispinal muscle of head. (05 Mar 2000) |
| hourglass head | In congenital syphilis, a skull with depressed coronal suture. (05 Mar 2000) |
| humeral head | The name applied to the heads of forearm muscles that attach to the humerus. Nomina Anatomica lists humeral heads (caput humerale...) of the following: 1) flexor carpli ulnaris muscle (... Musculi flexoris carpi ulnaris ); 2) pronator teres muscle (... Musculi pronatoris teretis ). Synonym: caput humerale. (05 Mar 2000) |
| humeroulnar head of flexor digitorum superficialis muscle | <anatomy> The head of the superficial flexor of the digits that attaches to both the humerus and the ulna. Synonym: caput humeroulnare musculi flexoris digitorum superificialis. (05 Mar 2000) |
| short head | For a muscle with two heads of origin (a "biceps" muscle), the head originating nearest the insertion. See: short head of biceps brachii muscle, short head of biceps femoris muscle. Synonym: caput breve. (05 Mar 2000) |
| short head of biceps brachii muscle | <anatomy> Head of biceps brachii originating from coracoid process of scapula. Synonym: caput breve musculi bicipitis brachii. (05 Mar 2000) |
| short head of biceps femoris muscle | <anatomy> Part of biceps femoris originating from linea aspera of distal half of femur. Synonym: caput breve musculi bicipitis femoris. (05 Mar 2000) |
| smaller posterior rectus muscle of head | <anatomy, muscle> Origin, from posterior tubercle of atlas; insertion, medial third of inferior nuchal line of occipital bone; action, rotates head and draws it backward; nerve supply, dorsal branch of first cervical (suboccipital). See: suboccipital muscles. Synonym: musculus rectus capitis posterior minor, musculus rectus capitis posticus minor, smaller posterior rectus muscle of head. (05 Mar 2000) |
| snake's-head | <botany> The Guinea-hen flower; so called in England because its spotted petals resemble the scales of a snake's head. <botany> Snake's-head iris, an iridaceous plant (Hermodactylus tuberosus) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth. Source: Websters Dictionary (01 Mar 1998) |
| sperm head | The anterior, usually ovoid, nucleus-containing part of spermatozoa. (12 Dec 1998) |
| spinal muscle of head | <anatomy> An inconstant extension of spinalis cervicis to the occipital bone, sometimes fusing with semispinalis capitis. Synonym: musculus spinalis capitis, biventer cervicis, spinal muscle of head. (05 Mar 2000) |
| splenius muscle of head | <anatomy, muscle> Origin, from ligamentum nuchae of last four cervical vertebrae and supraspinous ligament of first and second thoracic vertebrae; insertion, lateral half of superior nuchal line and mastoid process; action, rotates head and extends neck; nerve supply, dorsal primary rami of second to sixth cervical spinal nerves. Synonym: musculus splenius capitis, splenius muscle of head. (05 Mar 2000) |